西交《專業(yè)英語》在線作業(yè)-00003

  得分:100

一、單選題 (共 50 道試題,共 100 分)

1.The objective of the optimal economic operation of power systems is _____.

A.to minimize the total production cost

B.to maintain frequency constant

C.to maintain voltages constant

D.to ensure balance between generation and load

答案:

2.The electric machine that operates at speeds above synchronous speed works in _____ region.

A.motoring

B.generating

C.plugging

D.stopping

答案:

3.( ) is used as coolant in light-water reactors.

A.Gas

B.Organic compound

C.Molten salt

D.Water

答案

4.The toy boat turned over and sank to the (_______) of the pool.

A.base

B.depth

C.ground

D.bottom

答案

5.How much a man can earn depends (_______) his skills.

A.along

B.at

C.on

D.with

答案:

6.Finally, the teacher realized that the girl was crying ____.

A.because what he had said

B.because that he had said

C.because of what he had said

D.because of that he had said

答案:

7.The generator voltages are usually stepped up to the transmission voltage level by _____.

A.series capacitor

B.parallel reactors

C.step-up transformers

D.step-down transformers

答案:

8.We have come to a critical moment. You must take immediate (_______) .

A.act

B.action

C.activity

D.doings

答案:

9.It is generally considered unwise to give a child ____ he or she wants.

A.however

B.whatever

C.whichever

D.whenever

答案:

10.Can you come over for dinner with us? ----- (_______)

A.I'd like to but I have a meeting tonight

B.It doesn't matter

C.No, I don't like

D.Oh, that sounds well

答案:

11.Thank you ever so much for the book you gave me. --- (_______) .

A.No thanks

B.I’m glad you like it

C.Yes, it is good

D.No, it’s not so good

答案:

12.She is an easy-going girl. _________ you meet her, she will smile to you.

A.As

B.Everything

C.While

D.Since

答案:

13.The new English book I bought yesterday (_______) me almost twenty yuan.

A.spent

B.paid

C.cost

D.owned

答案:

14.Let's go by car. It's _______.

A.cheap a lot

B.cheap much

C.more cheap

D.much cheaper

答案

15.Image clarity on a computer screen is measured with _____.

A.screen size

B.dot pitch

C.resolution

D.color depth

答案:

16.The Buck(1/2笛故1/2變""器) is a ( ) converter.

A.voltage step-up

B.current step-down

C.current step-up

D.resistance

答案:

17.When an induction motor with 10 poles is supplied by 50Hz three-phase ac power source, the synchronous revolutions per minute is _____. (Synchronous r/min = 120 f/p)

A.1000

B.900

C.700

D.600

答案

18.——Have a good rest ; you need to ___your energy for the football match this afternoon .——Thanks a lot .

A.leave

B.save

C.hold

D.get

答案:

19.Her eyes were filled (_______) tears.

A.of

B.with

C.in

D.along

答案:

20.In a coal-fired power plant, an electrostatic precipitator is used to remove _____ from the combustion gases.

A.solid particle

B.SO2

C.CO

D.water vapour

答案:

21.May I have a look at your photo album? --- (_______) .

A.Yes, you have

B.It’s very interesting

C.This is my girl friend

D.Yes, of course

答案

22.They have lessons every day (_______) Saturday.

A.except

B.except for

C.except that

D.besides

答案:

23.I’ll make every (_______) to help you.

A.way

B.means

C.method

D.effort

答案

24.Most desktop computers use a separate _____ as a display device, where notebook computers use a flat panel LCD screen (liquid crystal display screen) that attached to the system unit.

A.keyboard

B.Mouse

C.Monitor

D.hard disk

答案:

25.The unit of logarithm of the magnitude of a transfer function is _____.

A.radians per second

B.volts

C.decibel

D.octaves

答案:

26.The teacher advised Joe to___before deciding to quit school.

A.think about

B.think twice

C.think up

D.think over

答案:

27.The red rose is her (_______) .

A.favor

B.favorite

C.like

D.best

答案:

28.Be sure to (_______) your work at the end of the exam.

A.look over

B.hang up

C.set aside

D.catch sight of

答案:

29.-________ you ________ free tomorrow?– No. I ________ free the day after tomorrow.

A.Are;going to;will

B.Are;going to be;will

C.Are;going to;will be

D.Are;going to be;will be

答案

30.It was on the beach (_______) Miss White found the cat lying dead.

A.where

B.which

C.on which

D.that

答案

31.Living in the central Australian desert has its problems, ___getting water is not the least.

A.for which

B.to which

C.in which

D.of which

答案

32.She would make a teacher far (_______) to the average.

A.superior

B.better

C.favorable

D.popular

答案:

33.I have no doubt (_______) he will overcome all his difficulties?r)

A.which

B.what

C.that

D.If

答案:

34.This one is not good, that one is ____.

A.more bad

B.even worse

C.still worst

D.more badly

答案:

35.When you have difficulties in translating the article, don’t (_______) to ask me.

A.hesitate

B.hesitant

C.hesitance

D.hesitation

答案:

36.As I felt so much better, my doctor (_______) me to take a holiday by the sea.

A.suggested

B.considered

C.advised

D.inquired

答案:

37.A computer printer is _____ device that produces computer-generated text or graphical images on paper.

A.an input

B.an output

C.a storage

D.a data processing

答案:

38.The village was (_______) two or three groups of simple houses, a church, a post office and a small general store.

A.composed of

B.consisted of

C.made of

D.built with

答案:

39.The DC-DC converts _____ input to _____ output.

A.direct current, alternating current

B.direct current, direct current

C.alternating current, alternating current

D.alternating current, alternating current

答案:

40.The transformer is a straightforward application of Faraday’s ______ Law.

A.Ohm’s

B.Electromagnetic Induction

C.Kirchhoff’s Current

D.Kirchhoff’s Voltage

答案:

41.Must I be home before seven? --- (_______) .

A.No, you needn’t

B.No, you mustn’t

C.OK

D.no, you won’t

答案:

42.These heavy walls expressed man's fear of the outer world and his need to find (_______) .

A.prevention

B.protection

C.preservation

D.preparation

答案:

43.My pain___obvious the moment I entered the office, for the first man I met asked pitifully, “Are you feeling all right?”

A.could be

B.could have been

C.must be

D.must have been

答案

44.The ship set out for the (_______) of the ocean depths.

A.exploration

B.explosion

C.expose

D.exposition

答案:

45.These are all (_______) demands.

A.reasonable

B.available

C.logical

D.formal

答案:

46.Charlie ________ here next month.

A.isn't working

B.doesn't working

C.isn't going to working

D.won't work

答案:

47.We go to the cinema (_______) a week.

A.often

B.once

C.seldom

D.usually

答案:

48.The story of George Washington and the cherry tree is (_______) every American school child.

A.known as

B.known to

C.known for

D.known in

答案:

49.The proposal seems quite good, but I can’t easily (_______) without all the facts.

A.join

B.judge

C.say

D.speak

答案:

50.—Is there anything I can do for you, sir?— ___.

A.Sure. Go ahead

B.No. Take your time

C.Yes. You’re welcome

D.Not now. Thanks anyway

答案:

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