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关于春节的来历科技英语写作习题答案

作者:高考题库网
来源:https://bjmy2z.cn/zuowen
2020-12-23 11:09
tags:英语学习, 精品文档, 习题答案

中国名人成长故事-看花灯

2020年12月23日发(作者:伏灵芝)


写作练习参考答案


练习

1

(on

page

8)


II.


1.

Nonlinear

distortion

can

be

< p>caused

by


too

large

an


input

signal.


2.

< p>Using


the


definition

o f

slope,

we

can

derive


the


equation

which

re presents


a


straight

line .


3.

The

expression

f( x

+

h)

f(x)

is

frequently

used

in

the

study

of

calculus.


4.

An

equation

which

can

be

written

in

the

following

form

is

known

as

a

linear

equation

in

one


unknown.


5.

In


a


computer,


the


tendency< /p>

is

to

operate

at

as< /p>


high

a


clock

rate< /p>

as

possible.


6.

The

voltage

across

this

capacito r

is

a

few

hundredths

< p>of

a

volt.


7.

The

output

of

the

factory

ten

years

ago

was

only

one

fifth

what

it

is

now

[

或:

only

one


fifth

its

present

output].


8.

The

difference

between

these

two

values

is

13

parts

in

10

< p>
4


.


9.

Tin

d oes

not

have

as

high

a

melting

point

as

lead

(does).


10.

This

averag e

velocity

is

half

the

final

velocity.


11.

It

is

necessary

to

find

h ow

long

a

time

it

ta kes

[

或:

is

required;

< p>is

needed;

is

necessary]

to


solve

this

equation.


12.

This

wire

is

fo ur

times

thicker

than

that

one.


13.

Electricity

can

be

easily

changed

into

other

forms

of

energy.


14.

In

1831,

Joseph

< p>Henry

in

the

United

Stat es

discovered

the

phenomenon

of

electromagnetic


induction.


15.

A

receiver

consists

of

several

units

[

或:

parts].


III.


1.

The

newly

designed

instrument

is

good

in

quality

[< /p>

或:

is

of

good

< p>quality].


2.

This

engine

needs

to

be

cleaned

[

或:

cleaning].


3.

This

running

machine

will

stop

of

itself

in


a

minute

or

two


[

或:

in

one

or

two

m inutes].


4.

In

this

ca se,

the

input

does

not

fall;

the

output

does

n ot

fall,

either

.

[

或:

…;

neither

[nor]


do es

the

output.]


5.

The

resistance

of

a

conductor

depends

not

only

on

the

material

of

which

the

conductor

is


made,

bu t

also

on

the

size

a nd

temperature

of

the

cond uctor.


6.

Another

comsat


was


launched


on

< br>the

morning

of

the

8


th


of

October.


I V.


1.

The

period

with< /p>

which

a

body

undergoes

simple

harmonic

motion

is

the

time

required

for

i t


to

make

one

complete

oscillation.

In

the

case< /p>

of

a

spring,

the

per iod

is

the

time

the

spring


spends

in

going

from

its

maximum

extension,

through

its

maximum

compressi on

and

back


1


to

its

maximum

extension

once< /p>

more.

For

all

types

of

simple

harmonic

motion,

the

period

T


is

given

[

或:

expressed;

denoted;< /p>

represented]

by


T

=

2

π

?

-S

?

/a

?

,


where

the

acceleration


a


is

th at

experienced

by

the

body

when

it

is

at

its

specified

position.


2.

×

×

:

male,

professor,

advisor

for

doctoral

students ,

and

academician

of

the

Chinese


Academy

of

Scie nces.

He

graduated

from

th e

Department

of

Radar

at

the

Institute

of

the


Communications

Engineering

of

< p>the

People’s

Liberation

Army

of

China

in

1953.


After

graduation

he

remained

at

the

Institute

as

a< /p>

faculty

member.

He

success ively


held

the

posts

o f

head

of

a

teaching

and

research

section,

chairman< /p>

of

a

department,

and


vice

president

of

the

Institute.

From

1984

to

1 992

he

served

as

president

of

Xidian


University.

He

is

currently

chairman

of

the

Academic

Commission

of

Xidian

University


and

chairman

of

the

Academic

Commission

of

the

National

Key

Laboratory

of

Radar

< p>
Signal

Processing.

He

is

also

member

of

the

Co mmittee

of

the

National

Sc ience

Fund

for


Outstanding

Youths,

and

fellow

of

the

Chinese

Institute

of

Electronics.


He

has

long

been

engaged

in

research

< p>and

teaching

in

the

fiel ds

of

radar

and


inform ation

processing.

In

recent

< p>years,

his

research

interests< /p>

focus

on

statistical

signa l


processing,

array

signal

processing,

and

self-adaptive

signal

processing.


……………………………… ………………………………………………………………………..


练习

2

(on

page

23)


II.

< p>
1.

This

book

is

of

great

help

to

electronic

engineers.


2.

Of

the

first

four

chapters

,

C hapter

3

is

the

most

important.


3.

This

problem< /p>

can

be

solved

with

g reat

ease

.


4.

In

< p>this

case,

current

leads

voltage

by

90


o


.


5.

Through

the

analys is

of

the

parameters

of

this

device

[

或:

By

analyzing

the

parameters


of

this

device],

we

can

understand

its

performance.


6.

For


x


>

0< /p>

,

there

is

no

soluti on

to

the

equation.


7.

Now

it

is

necessary

for

us

to

solve

this

< p>equation

for

that

unknown

< p>.


8.

Upon

substitution

of

these

values

,

it

is

found

that


v

is

equal

to

the

velocity

of

light.


9.

Capacita nce

is

measured

in

farads< /p>

.


10.

This

computer

is

very

small


in

s ize


.


11.

These

wa ves

travel

only

in

one

direction

.


12.

In

their

study

of

electricity

,

physicists

defined

electric

field

intensity.


13.

Th is

answer

appears

correct

.


14.

This

coefficient

remains

to

be

determined

.


2


15.


16.

17.


18.


19.


20.


21.


22.


23.


24.


25.


26.


27.

< p>
28.


29.


30.


II I.


The

two

equations

< br>below


will

be

used

often

in

later

chapters.

< br>Here

we

use

two

metal

balls

two

meters

apart

< p>.


This

paper

contains

< p>nothing

new

.

[

或:

There

is

nothing

new

in

this

paper.]


The

force< /p>

acts

perpendicular

to

the< /p>

surface

of

the

table

.


This

rule

can

be

used

for

[

或:

can

apply

to]

all

integers ,


both

positive

and

ne gative


.


A

neutron

has


a

slightly

larger

mass

than

a

proton


.< /p>

[

或:

has

a

m ass

slightly

larger


than

that

of

a

proton.]


Electrons

are

the

smallest

particles

present

in

ordinary

matter

.

[

particles

that


exist

in

ordinary

matter.]


All

the

textbooks


available


discuss

this

problem.


Ac curate

in

operation

and

hi gh

in

speed

[

或:

In< /p>

view

of

their

accurate

operation

and


high

speed] ,

computers

have

found

wid e

applications.


Medium-size

computers

now

perform

as

l arge

computers

not

long

ag o

[

或:

of

near

past]


did

.


The

input

voltage

goes

negative

and

the

energy

stays

constant

.


These

rays

seem

to

come

from

the

image

.


Impedance

in

an

a-c

circuit

plays

the

same

role

that

resistance

does

in

a

d-c

circuit.

< br>Two

parallel

wires

a

di stance

(of)

δ

apart

carry< /p>

the

current


i


.


The

equations

here

are

of

great

importance.


We

shall

use

a

cable

1 0

meters

long

.


1.

That

professor

is

much

[

或:

very]

interested

in

this

topic.


2.

These

multimeters

are

much

alike

in

size

and

weight.

< br>3.

This

voltage

can

har dly

be

measured.


4.

In

this

laboratory,

this

ins trument

is

better

than

any

other

one

[

或:

than

any

one

else].

5.

To

repair

the

machine ,

the

serviceman

has

to

remove

the

cover

.

[

或:

Before

the

machine


can

be

repaired,

the

cover

has

to

be

removed.]< /p>


6.

The

preface

to

< p>this

book

is

well

writte n.


IV.


1.

The

prim ary

winding

of

a

transform er

is

the

coil

which

is

fed

with

an

alternatin g

current,


and

[

或:

while]

the

secondary

winding

is

the

coil

to

whic h

power

is

transferred

via

the


changing

flux.

Th e

designations

of

the

prim ary

and

the

secondary

depe nds

only

on

how


the

transformer

is

connected;

ei ther

winding

may

be

the

primary,

and

the

other

is

then

the


secondary.

< p>
2.

×××

:

male

and

born

in

Funing

County,

Jiangsu

Province

in

1962.

He

graduated

from


Xidian

University

and

earned

the

B.

Eng.

Degree,

the

M.

Eng.

Degree,

and

the

< p>Ph.

D.


3


degree

in

1982,

1985,

and

1990

respectively.

In

1994

he

was

exceptionally

promoted

to


professor.

Presently

he

holds

the

posts

of

dean

of

the

School

of

Te lecommunications


Engineering

of

Xidian

University

and

direct or

of

the

Research

Institu te

of

Information


Science.

He

is

an

advisor

for< /p>

doctoral

students,

a

fello w

of

the

Chinese

Institute

of


Communications,

a

senior

member

of

IEEE,

and

a

senior

member

of

the

Chinese

Institute


of

Electronics.

He

was

granted

the

title

of

“Expert

with

Distinguished

Achievements”

of


both

Shaanxi

Province

and

the

Ministry

of

El ectronics

Industry.

He

is

a

recipient

of

the


Gov ernment

Special

Subsidy.


He< /p>

is

engaged

in

the

re search

in

the

fields

of

mobile

communication,

personal


communication,

and

so

on.

He

has

obtained

one

“National

Invention”

patent

and

won


quite

a

few

Science

and

Technology

Progress

Awards

at

provincial

and< /p>

ministerial

levels.


…………………… ………………………………………………………………………………


练习

3

(on

page

31)


II.


1.

Since

feedback

plays

an

important

role

in

electronic

circuits,

its

study

is

of

great


importance.


2.

The

black

hole

is

invisible,

but

its

p resence

can

be

deduced.

3.

Electromagnetic

waves

trave l

at

the

speed

of

li ght,

and

require

no

materi al

for

their


passage

.


4.

From

its

definitio n

as

the

ratio

of

di stance

to

time,

speed

is

expressed

in

meters

per


second.


5.

Their

diff erence

in

this

case

is

13

parts

in

a

million

[

或:

per

million;

in< /p>

10


6


].


6.

Our

analysis

of

the

dio de

will

be

of

great

significance.


7.

This

facili tates

their

use

in

circuit

analysis.


8.

The

succ ess

in

design

depends

on

our

correct

choice

of

the

circuit.


9.

It

is

necessary

to

take

into

account

their

collisions

wit h

each

other.


10.

Here

we

must

use

wires

< br>one

thousandth

the

diameter

of

a

silk

thread.


11.

This

law

holds

(true)

for

[

或:

applies

to ]

the

bodies

the

speed

of

a

rocket.


12.

We

must

frequency

modulate

t he

carrier.


13.

This

d evice

is

radio

controlled.


14.

AC

can

be

changed

into

DC,

a

process

called

rectification

.


15.

To

solve

this

problem,

< p>we

must

take

everything

into

account,


a

complicated< /p>


procedure

.


16.

An

instrument

for

measuring

current,

voltage

and

resistance< /p>

,

the

multimeter

is


17.


widely

used

in

the

work

having

connection

< p>with

electricity.


This

pap er

deals

with

advantages

o f

AC

over

DC

.


4


18.


19.


20.

< br>The

answers


to


these< /p>

problems

appear

in

the

back

of

the

book.


T his

curve

shows

the

fall

in

[

of]

co nductivity

with

increasing

[

increased]


temperatur e.


These

materials

are

pressure

sensitive

.


III.



features


of

th is

device


are

small

si ze

and

light

weight


.< /p>


types

of

electric

motor

are

also

widely

u sed

in

industry.


3.

No

students

[

或:

None

of

the

students]

can

solve

this

special

kind

of

< p>equation.


4.

Not

until

the

invention

of

the

mi croscope

did

the

real

stud y

of

bacteria

become

possi ble.


do

not

know

< p>if

this

material

could

s tand


so

large

a


fo rce

[

或:

whether

t his

material


could

stand

so

large

a

force

or

not].


machine

will

automatically

start

to

operate< /p>

again

in

two

hours

.


IV.


1.

The

second

law

of

motion

provides

a

method

for

measuring

what

is

called

the

“inert ial


mass”

of

a

body.

All

one

needs

to

do

is

[OR:

All

that

is

necessary

is;

One

only

< p>needs]

to


apply

the

same

force

in

turn

to

< p>a

standard

of

mass

and

to

an

unknown

mass

an d

then

to


compare

thei r

accelerations,

something

that< /p>

[OR:

…,

which]

can

b e

done

anywhere

in

the


universe

with

the

same

results.

No

matter

where

we

are,

we

can

always

tell

a

wooden

ball

from

a

lead

ball

of

< p>the

same

size

by

throwin g

them.


2.

××

×:

male,

born

in

1938,

profe ssor,

and

advisor

for

doct oral

students.

He

graduated

< p>
from

the

Xi’an

Military

Telecommunications

Engineering

Ins titute

in

1964

and

remaine d


there

as

a

faculty

member.

He

has

long

b een

engaged

in

the

teachin g

and

research

in

the

< p>
field

of

radar.

Through

close

cooperation

with

quite

a

few

radar

research

< p>institutes

and


enterprises,

< p>he

has

successively

undertaken

or

taken

charge

of

more

than

twenty

national


defence

key

preliminary

rese arch

projects

and

engineering

projects

with

many

practical


achievements,

most

of

which

have

been

popularized

and

applied,

or

used

to

equip

the


armed

force s,

thus

making

contributions

to

the

development

of

r adar

technology

in

China.


…………………………………………………………………………………………………

练习

4

(on

page

39)


II.


1.

This

equipment,

it

is

said

,

was

< p>commercially

available

three

y ears

ago.

[OR:

It

is


said

that

….;

This

eq uipment

is

said

to

have

been

commercially

available

three

years


ago.]


2.


h


fe


is

a

p arameter

which

we

think

is

very

important.


3.

No w

we

connect

a

conductor

charged

with,

let

us


say


,

positive

electrici ty,

to

the


ground.


5


4.


5.


6.

7.


8.


9.


10.


11.


12.


13.


14.


15.


16.


17.

< br>18.


19.


20.


21.


III.


-1

- 1,


it

was

agreed


,

should

be

replaceable

by< /p>

–1

at

will.


Velocity,< /p>

we

have

noted

before

,

is

a

vector

quantity.


None

of

these

windows

can

withstand

so

large

< p>a

force.


All

the

com puters

in

our

laboratory

a re

not

very

good

in

quality.


No

textbooks


av ailable

[OR:

None

of

the

textbooks

available]

have

m entioned

this


point.


Stu dents

are

familiar

with

no ne

of

these

parameters

.

[OR:

No

students

are

familiar


with

these

paramete rs.]


In

this

shop

all< /p>

these

components

are

not

available.


As

early

as< /p>

the

1820s,

it


had

< p>been

realized


that

this

metal

could/can

be

used

< p>in


industry.


They

have

been

developing

a

special

kind

of

robot

since

1998.


Full

use

must

b e

made

of

the

equipment

available.

[OR:

The

equipmen t

available


must

be

ma de

full

use

of.]


It

is

expected

that,

by

t he

time

the

device

arrives

at

that

research

institut e,

the


technical

personnel

there

will

have

studied

its

principle

of

operation.


Attention

must

be

paid< /p>

to

the

polarities

of

this

battery.

[OR:

The

po larities

of

this


battery

must

be

paid

attention

to.]


Sound

travels

much

< p>more

rapidly

in

hydrogen

than

in

air.


Some

dev eloped

countries

use

as

mu ch

as

60

kilograms

of

< p>paper

for

each

person

in


a

year.


The

darke r

the

color,

the

more

< p>heat

is/will

be

absorbed.

< p>
The

greater

the

resistance

of

a

wire,

the

more

energy

will

be

dissipated

in

it.


Of

all

t hese

instruments

,

this

on e

is

most

commonly

used.


This

astronomical

observatory

is

the

largest

in

o ur

country.


1.

This

ex periment

begins


at


eight

o’clock/


in


May/


tomorrow


.


2.

The

voltage

across

the

resistor< /p>

is

measured

in

volts.

< p>
3.

Both

the

engineers

< p>are

busy

(in)

designing

a

new

type

of

computer.

[OR:

busy

with


t he

design

of

….]


4.

Copper

is

a

kind

of

matter

and

so

is

air.< /p>


5.

We

find

this

concept

very

difficult


to

explain


.


6.

They

will

leave

for

Beijing

to

attend

an

international

< p>conference

on

communications.


IV.


1.

When

a

wire

loop

surrounds

a

stationa ry

magnet,

no

current

flow s

in

the

loop.

What


Faraday

and

Henry

discovered

was

that

moving

the

magnet

causes

a

current

t o

flow

in

the


6


loop.

It

does

not

matt er

whether

the

magnet

or

the

loop

is

actually

being

moved;

the

origin

of

the

current

lies

in

the

relative

motion

between

a

conductor

and

a

m agnetic

field.


2.

A

le ver

is

a

rigid

rod

p ivoted

at

a

certain

point< /p>

called

the

fulcrum.

Fig.

12-1

shows

the


most

familiar

type

of

lever,

with

a

load

at

one

end

being

balanced

by

an

applied

force

at


the

other.

The

condition

for

equilibrium

is

that

the

torques

produced

by


F


in


and

F


out


be

the


same

in

mag nitude.


3.

×

×

×

:

male

and

born

in

December

1941.

He

graduated

< p>from

the

Xi’an

Military


Telecommunications

Engineering

Ins titute

(the

predecessor

of

Xidian

University)

and


rema ined

at

the

institute

as

a

faculty

member.

From

< p>1981

to

1983

he

stayed

at

the


University

of

Pennsylvania,

U.S.A.

for

fur ther

studies,

engaged

in

t he

research

on

image


a nalysis

&

processing

and

r adar

imaging.

From

1989

to

1990

he

went

to

the

United

States


and

Bri tain

successively

as

a

vis iting

scholar.

Currently

he

< p>serves

as

president

of

< br>Shenzhen

University,

being

an

advisor

for

doctoral

stud ents

of

Xidian

University

in

the


academic

area

o f

signal

and

information

p rocessing.

He

has

been

in< /p>

charge

of

and


undertak en

quite

a

few

projects,

all

with

high-level

achieve ments.


……………………………………………………………………………………… ………….


练习

5

(on

page

43)


II.


1.

It

is

quite

possible

for

us

to

solve

this

equation.


2.

It

takes

only

a< /p>

few

months

to

design

a

new

type

of

airplane

with

the

help

of

a


computer.


3.

It

remai ns

now

for

us

to

cal culate

the

resistance

in

t his

circuit.


4.

It

is< /p>

left

as

a

problem

to

the

reader

to

show

that

this

formula

holds.

< br>5.

The

program

to

be

executed

is

stored

in

this

unit.


6.

This

val ley

is

used

as

the

f oundation

on

which

to

buil d

the

dam.


7.

There

are

many

types

of

mult imeters

to

choose

from.

8.

The

velocity

of

light

is

too

great


to

be

measured

in/with

simple

< p>units.


9.

Let

it

be< /p>

required

to

find

out

this

angle.


10.

Let

< br>t


o


be

equal

to

zero.


11.

This

equati on

is

very

difficult

to

solve.


12.

The

farther

away

the

target

(is),

the

longer

it

takes

for

the

echo

to

return.

< br>13.

We

find

this

proble m

easy


to

solve.


1 4.

For

this

series

to

< p>converge,


x


must

be

less

than

1.


15.

T he

ability

of

a

capacitor< /p>

to

store

a

charge

is

affected/influenced

by

a

few

factors.


16.

This

is

a

pen

to

draw

pic tures

with.


17.

For

Q< /p>


2


to

conduct

,

its

base

must

be

about< /p>

1.8

volts.


7


18.

We

have

to

find

out


how

large

to

make


r


so

as

for

the

series

to

converge.


III .


1.

Substituting

Eq.

(7)

in/into

Eq.

(8)

,

< p>we

obtain/have/get


a=b.

[

或:

Substitution

of

Eq.


(7)

into/in

Eq.

(8)

gives/yields/results

in


a=b.< /p>


2.

Sound

travels

less< /p>


fast


than

light

does.


3.


Every

one/Eac h

of

the


methods

has


its


advantages

and

disadvantages.


4.

Work

equal s/is

equal

to

force

multip lied

by

distance

[

Work

equals

force

times


distance.

或:

Work

is< /p>

the

product

of

force

and

distance.]


5.

Usually

we

can

not

see

the

earth’s

shadow,

because

ther e

is

nothing

for

it

to

fall

on.


6.

This

equipment

has

quite

a

few


advantages


all


i ts


own.


IV.


1.


2.


3.


V.


Xidian

University

is

a

national< /p>

key

institution

of

higher< /p>

learning/education

which

integra tes


engineering,

science,

li beral

arts

and

management,

with

information

and

electronic s

as

the


dominant

acad emic

areas.

It

is

located< /p>

in

the

ancient

cultural

city

of

Xi’an

and

occu pies

an

area

of


60

hectares

with

a

beautiful

environment

on

the

campus.

It

has

established

nine

< p>schools

and

one


college,

i.e.,

School

of

Telecommuni cations

Engineering,

School

of

Economy

and

Management,


School

of

Electronic

Engineerin g,

School

of

Computer

Scie nce

and

Technology,

School

of


Mechano-Electronic

Engineering ,

Adult

Education

College,

etc.

There

are

17

departm ents


with/covering

over

60

specialties

for

undergraduates

and

junior-college/three-year-program


students.

The

University

has

the

right

to

examine< /p>

and

approve

professorship

and

qualifications

for


docto ral

advisers.

It

has

set

up

about

34

academic

areas

for

master’s

degrees

and

14

academic


areas

for

doctoral

degrees,

of

which

there

are

3

national

key

areas

(i.e.,

“communi cation

and


electronic

system ”,

“signal

and

information

processing”,

and

“circuit

and

system”)

and

11


ministe rial-level

key

areas.


……………… ……………………………………………………………………………………….


练习


6


(on

page

49)


II


1

A

transformer

is

a

device

co nsisting

of

two

or

more

coils

wound

on

the

iro n

core.


2.

This

book,< /p>

properly

used,

is

of

great

help

to

the

reader.


3.

The

magnetic

lines

of

force

representing

the

magnetic

field

are

concen tric

circles


8


This

< p>new

method

has

the

advan tages

of

high

efficiency

a nd

easy

adjustment.


The

< p>sine

law

of

the

variatio n

of

the

light

intensity

with

the

cylinder

diameter< /p>

has

been


emphasized.

< br>Our

method

is

different

from

those

described/presented

in

the

papers

available

on/discussing

the

same

problem .


4.


5.


6.


7.


8.


9.


10.


11.


12.


13.


14.< /p>


15.


16.


III.

< br>surrounding

the

wire.


In< /p>

this

case,

electrons

will< /p>

possess

greater

energy

[

或:

the

energy

electrons

possess

will

be


greater],

(thus)

increasing

the

bri ghtness

of

the

spot.


T he

sunlight

falling

upon

p hoto-electric

cells,

the

device< /p>

will

automatically

go

into


operation.


Given/Knowing

< p>time

and

speed,


we

c an

find

out

distance.


All

these

networks

have

th e

property

of

being

able

to

transform

impedance

leve ls.


Enzymes

increase

the

speed

of

chemical

reactions

without

being

changed

thems elves.


By

finding

two

points

on

the

straight

lin e,

we

can

draw

the

l ine.


Finding

the

possible

values

of

these

symbols

< p>
is

called


solving

the< /p>

equation.


Automation

is

< p>not

a

question

of

machin es

replacing

man.


These

< p>integrated

circuits

were

desig ned

with

one

or

two

uses

in

mind.


Let

us

construct

a

circle

of

radius


R


,

with

t he

origin

as

the

center.


The

equation

to

the

circle

with

the

center

at

the

origin

and

of

radius


a


is


x


2


+

y


2


=

a


2


.


With

other

gates

as

loads,

the

output

voltage

will

be

approximately

3.5

volts.


With


u


=2

km/sec

and


v


=11.2

km/sec,

m


0


/m


1


=

270.


1.

By

obser ving

the

effect

of

a

new

drug

on

the

patients,

one/we

can

see

its

therapeutic


effect.


2.

I ron

is

almost

as

good

< p>a

conductor

as

aluminium.

< p>
3.

It

is

easy

for

us

to

determine

the

we ight

of

the

body.


4.

Friction

makes

the

work

put

into

a

machine

grea ter

than

the

useful

work

accomplished


by

it.


5.

On

being

heated,

the

air

in

the

bottle

wil l

expand.


6.

Many

of

the

principles

of

a

r eceiver

also

apply

to

a

transmitter.


IV.


1.


2.


3.


V.


Current ly

the

University

has

1285 3

students

of

various

type s,

of

whom

there

are

7658


undergraduates

and

abo ut

900

graduate

students.

In

more

than

60

years

< p>since

its

founding,

it

h as


produced

over

60000

graduates

of

various

types

< p>who

work

in

the

fields

of

national

defence,


9< /p>


Only

through


the

s tudy

of


[OR:

Only

by

studying]

the

performance

o f

the

system,


can


one/we

appreciate/understand

its

advantages.


If

the

self-bia s

circuit

is

of

poor

design

[OR:

is

not

design ed

well/properly],

chopping


oscillations

will

take

place

in

the


LC


oscillator.


This

paper

presents

a

CAD

method

for

increasing

the

printing

speed

and

improving

the


printing

q uality.


electronics,

posts

a nd

telecommunications,

aerospace

and

aviation

in

China,

ac hieving

splendid


results

in< /p>

the

nation’s

economic

cons truction.


The

University

enj oys

a

well-qualified,

high

academic

level,

and

reasonably< /p>

structured


contingent

of

teachers.

There

is

now

a

teaching

and

administrative

staff

of

over

3200,

of

whom


there

are

more

than

2100

technical

profess ionals,

with

1

academician

of

the

Chinese

Academy

of


Sciences,

26

national

or

provincial

&

ministerial-lev el

experts

who

have

made

outstanding


contributions,

an d

over

600

teachers

with

senior

academic

titles.


……………………………………………………………………………………………………


练习

7

(on

page

54)

II.


1.

Heat

rays

are

emitted

by

all

(material)

bodies

no

matter

how

< p>low

their

temperatures


are .


2.

Small

as

they

are,

atoms

are

made

up< /p>

of

still

smaller

units.


3.

The

measurement

of

angles

is

unique

in

th at

the

unit

is

dimensionle ss.


4.

The

body

is

in

such

a

state

that

it

can

do

work.


5.

These

double-angle

formulas

can

be

used

any

time

we

have

expressed

one

angle

as


twice

another.

< p>
6.

The

problem

was

n ot

to

be

solved

until

< p>a

radically

new

and

diff erent

concept

was


introduced .


7.

Something

further

must

be

done

to

these

signals

before

they

are

fed

to

the

subsequent


stage.


8.

Every

substance,< /p>

be

it

[

或:

whether

it

be]

a

solid,

a

liquid,

or

a

gas,

consi sts

of

atoms.


9.

There

are

various

indications

[

或:

All

indications

are]

that

the

price

of

com puters

will


continue

to

< p>fall.


10.

There

is

n o

evidence

that

energy

can

be

created

or

destroyed.< /p>


11.

In

this

case

there

is

no

assurance

tha t

the

circuit

is

tuned

to

that

frequency.


12.

These

experiments

lead

to

the

result


that

with/for

a

constant

force,

the

acceleration

is


inversely

proportional

to

the

mass.


13.

The

idea

that

eve rything

is

made

up

of

< p>very

small

particles

was

known

to

the

Greeks


1 4.


15.


16.


17.


over

two

thousand

years

ago.


Since

then,

there

have

been

speculations

wheth er

life

exists

on

other

planets.


This

is

due

to/results

from/arises

from/is

< p>caused

by

the

fact


t hat

there

exists

capacitance


in

the

circuit.


Besid es

the

fact

that

the

properties

of

the

material

< p>should

be

included

in

th e


analytical

model,

we

must

take

other

factors

i nto

account.


The

term


follower


comes

from

the< /p>

fact

that

the

output

voltage

follows

the

signal

< p>voltage


10


quite

close ly.


18.

Using

the

fact

that

the

curve

passes

through

(2,

1),

we

can< /p>

evaluate

the

constant.


19.

The

usefulness

of

the

Karnaugh

map

lies

in

< p>the

fact

that

adjacent

c ells

can

be

grouped


vi sually

to

eliminate

redundant

variables.


20.

This

seri es

of

experiments

leads

to

the

result


that

with< /p>

a

constant

force,

the

< p>acceleration


is

inversely

proportional

to

the

mass.


III.


1.


2.


3.


4.


5.


6.


IV.


1.

The

mathematical

d escription

of

and

the

full -compensation

conditions

for

the

3-

axis


steady-tracking

principle

are

also

given.


2.

A

comparison

of

STM

and

ATM

is

made

,

which

shows

that

ATM

will

be

the

basis

of


BISDN.

[

或:

A

comp arison

between

STM

and

ATM

shows

that

ATM

will

be

the

basis

of


BISDN .]


3.

A

detailed

analy sis

of

the

ability

of

< p>the

components

to

carry

loads

is

made

.


V.


The

University

persists

i n

the

principle

of

cultiva ting

students

with

all-around

development

of


morality,

intelligence

and

physique,

and< /p>

pays

great

attention

to

the

teaching

of

both

b asic

theories


and

practice.< /p>

By

adhering

to

high

and

strict

demands,

it

has

practised

setting

some

ou tstanding


teachers

as

its

Prestigious/Top-Notch

Teachers

and

establishing

some

Best- Quality/First-Rate


Courses.

It

has

also

practised

the

credit

system,

the

system

of

selecting

excellent

students,

the


scholarship

system,

the

system

of

giving

aw ards

to

outstanding

teachers,

the

system

of


encouragin g

undergraduates

to

take

b oth

a

major

and

a

mi nor,

the

system

of

enrolli ng

some

bright


high-school

graduates

as

college

studen ts

and

some

outstanding

co llege

graduates

as

graduate

< p>
students

without

their

sit ting

for

the

national

entr ance

examinations,

and

the

system

of

retaining


the

qualification

of

some

college

graduates

to

enter

their< /p>

graduate

programs

in

a

few

years

after


passing

the

entrance

exams,

all

of

which

are

reforms

ca rried

out

at

the

Universit y.


The

University

had

widely

promoted

exchange

and

cooperation

at

home

and

abroad

and


successively

est ablished

friendly

cooperative

re lations

with

a

batch

of

famous

universities

of

USA,< /p>


Japan,

Russia,

Holland,

< p>and

Canada,

and

with

man y

institutions

of

higher

l earning

at

home.

It

has


carried

out

the

activiti es

of

the

joint

cultivatio n

of

graduate

students,

th e

cooperative

scientific


11< /p>


Air

exerts

pressure

in

every

direction.


The

hotter

the

body

(

is

),

the

more

energy

it

radiates.


This

is

the

largest

aircraft


that

has

ever

been

manufactured

in

China.


Semiconductors

w ill

be

discussed

in

Chapte r

2.


The

ability

of

some

elements

to

give

off

radiations

is

referred

to

as

radioactivity.


To

do

all

this

,

a

s ound

knowledge

of

computer

science

is

necessary.


resea rch,

and

the

mutual

invita tion

of

scholars

to

delive r

lectures.


………………………………………………………… ………………………………………..


练习

8

(on

page

58)


II.


1.


Which

equation

we

should< /p>

use


will

depend

on


what

data

we

have

b een

given

in

the


probl em.


2.

It

is

obvious

that

these

systems

will

function

together.


3.

It< /p>

is

a

well-known

fact

that

all

matter

is

made

up

of

minute

particles.


4.

It

has

been

foun d

that

the

direction

of

the

current

is

just

op posite

to

that

of

the

< p>
electron

flow.


5.

It

follows

(from

above)

that

the

slope

at

that

poi nt

is

zero.


6.

It

< p>can

happen

that

the

over all

phase

shift

becomes

ze ro.


7.

At

first

glance

it

does

not

appear

that

this

integral

fits

an y

of

the

forms

presented

in


this

chapter.


8.

It

does

not

matter

how

we

define


f(x).

9.

It

makes

no

differenc e

which

point

is

chosen

as

the

origin.


10.

It

is

necessary

to

determ ine

under

what

conditions

this

equation

is

true.


11.

It

often

happens/It

i s

common/It

is

often

the

case

that

we

may

obta in

different

forms

of


solution.


12.

From

what

< p>has

been

described

above

it

follows

that


F

=

ma.


13.

This

device

is

just

what

we

need.


14.

Now

let

us

su mmarize

what

has

been

prov ed

so

far.


15.

This

value/Magnitude

is

quite

dif ferent

from

what

it

was.


16.

Current

changes

wit h

what

is

called

resistanc e.


17.

This

integral

i s

what

is

known

as

t he

improper

integral.


18.

The

reader

can

understand

what

the

function

of

t his

device

is

[

或:

what

this

device


can< /p>

do/perform.]


19.

What

a

generator

does

is

(to)

convert

mechanical

energy

i nto/to

electrical

energy.


20 .

This

magnetic

force

is

what

makes

electric

motors< /p>

run.


III.


1.

By

power

is

meant

the

spe ed

,

or

rate,

of

doi ng

work

[

或:

or

rate,

at

which

work

is


being

done].


2.

I n

this

case

[OR:

Under

this

condition],

the

wheel

will

rotate

(by/through)

360


o


.


3.

The

temperature

of

the

water

is

read

at

two-minute

i ntervals.


4.

The

direction

of

an

electric

current

< p>was/had

been

decided

before

electrons

were


discovered.


12


5.

Neither

those

receivers

nor

this

transmit ter


is


out

of


order.


6.

The

question

(that/which)

we

are

discussing< /p>

now

is

what

radio

wa ves

are.


IV.


1.

Th ere

are


m


polygons

altogether/in

all

,

each

of

which

has


N


ver texes.

[

或语法上正确、


但很不好的一个句型:< /p>

…,

the

number

of

ver texes

of

each

of

which

is


N.


]


2.

This

is

due

to


the

fact


that

there

exists

a

capacitance


across


the

PN

junction.

[

或更简洁的< /p>


一个句型:

due

to

t he

existence

of

a

capacita nce

across

the

PN

junction .]


3.

This

method

requ ires

accurate

location

,

t hus

making

[OR:

which

make s]

its

realization


somewhat< /p>

difficult.


V.


The

Qin

Yong-brand

whole

milk

powder

is

made

from

high-q uality

fresh

milk,

white

s ugar


and

trace

elements

< p>needed

by

the

human

body

by

scientific

methods

and

Denmark’s

advanced


technolo gy.


The

Qin

Yong-brand

whole

milk

powder

contains

< p>calcium,

protein

and

varied

vitamins,

and


it

can

be

mixed

with

lukewarm

sanitary

drinking

water

into

[OR:

can

be

blended

with


lukewarm

sanitary

drinking

water

to

produce]

the

best

fresh

milk.

The< /p>

product

is

truly

a

t onic


suitable

for

both

the

old

and

the

young.

Taking

it

for

a

long

time

is

beneficial

/of

< p>benefit

to

[OR:


is

g ood

for]

the

development

o f

the

brain

and

the

improvement

of

health.


If

you

find

anything

wrong

< p>with

the

product,

please

give

us

a

phone

call

< p>[OR:

please

let

us


k now

by

phone].


Our

tel ephone

number:


……………………………… ……………………………………………………………………..


练习

9< /p>

(on

page

68)


II.


1.

There

is

another

f orm

of

energy

we

must

< p>take

into

account.


2.

< p>We

can

find

a

force

< p>to

which

these

two

force s

are

equivalent.


3.

W e

shall

first

discuss

the< /p>

waves


whose

frequency

is

constant.


4.

The

me ter

which

is

used

to

measure

current

is

known

as

an

ammeter.


5.

Most

of

the

information

we

get

in

our

everyday

lif e

is

obtained

through

the< /p>

medium

of


light.


6 .

The

special

frequency

at

which


X


L


=

X


C


is

called

the

resonant

frequency.


7.< /p>

During

the

ten

years


since

this

book

was

p ublished,


great

changes

have

been

seen

in


electron ics.


8.

This

is

the

most

sensitive

instrument

th at

we

have

ever

had

in

our

laboratory.


9.

Everything

that

is

hot

rad iates

energy.


10.

We

m ust

calculate

the

distance

the

body

is

lifted.


1 3


11.


12.


13.


14.


15.


16.


17.< /p>


18.


III.


1.

2.


3.


4.


5.


6.


IV.


The

direction


the

plane

flies


i s

an

important

factor.


n


2


is

odd,

which

means/indicates

that


n

< p>
is

odd.


I


1


is

much

greater

than

< br>I


2


,

in

which< /p>

case


I


2


can

be

neglected.


As

we

shall

see,

the

free

ele ctrons

in

a

conductor

also

play

an

important

role

in

the


conduction

of

heat.


As

the

name

s hows,


this

chapter

deals

with

periodic

functions.


Such

meters

as

we

use

< p>to

measure

resistance

are

< p>spoken

of

as

ohmmeters.


We

must

first

determine

< p>the

limit

as


c


→ ∞

.


It

is

generally

possible

to

write

down

more

loop

equations

than

are

needed.


Not

only

d o

temperature

and

light

af fect

the

conductivity,

but

the

addition

of

impurities

< p>to


semiconductors

will

als o

make

it

change

greatly.< /p>


Satellites

are

frequently

launched

to

obtain

informati on

about/on

space.


Our

semiconductor

industry

came

int o

being

at

the

end

o f

the

1950s.


The

direc t

current

flows

always

in< /p>

one

direction.


An

8-vo lt

battery

must

be

used

here.


My

colleagues

and< /p>

I

would

like

to

expr ess

our

thanks

to

Professo r

W.

Smith

for

his

g reat


help.


1.

The

recognition

of

A

and

the

determination

of

B

are

< p>the

prerequisites

for

the

< p>use

of

this


method.


2.

Finally,

some

problems

that

deserve

to

be

not ed

in

implementing

this

me thod

and

their


solutions

are

presented.


3.

A

new

technique

for

estimating

the

Doppler

frequency

rate

is

proposed

which

gives

a


high

accuracy

and

requires

a

small

amount

o f

computation.


V.


A

< p>highland

wild

plant,

JUEMA

belongs

to

the

rose

fam ily.


[

或:

JUEMA

is

a

highland

wild


plant

belonging

to

the

rose

f amily.]

It

contains

vitamins

and

elements

such

as

ir on,

magnesium,


calcium,

(and )

zinc.

Pharmacological

study

shows

[OR:

It

has

been

proved/shown

through


pharma cological

study]

that

taking

it

for

a

long

time

< p>[OR:

a

long-term

administratio n/intake]


will

prolong

life,

resist

cancer

and

reduce< /p>

weight.

It

is

also

a

good

gift

for

your

relatives

and


friends.


… …………………………………………………………………………………………………..


练习

10

(

on

page

75)< /p>


II.


1.

Without

sem iconductors,

satellite

communications< /p>

would

be

impossible.


1 4

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