西交《专业英语》在线作业-00003


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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
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2.The electric machine that operates at speeds above synchronous speed works in _____ region.
A.motoring
B.generating
C.plugging
D.stopping
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3.( ) is used as coolant in light-water reactors.
A.Gas
B.Organic compound
C.Molten salt
D.Water
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4.The toy boat turned over and sank to the (_______) of the pool.
A.base
B.depth
C.ground
D.bottom
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5.How much a man can earn depends (_______) his skills.
A.along
B.at
C.on
D.with
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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
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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
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8.We have come to a critical moment. You must take immediate (_______) .
A.act
B.action
C.activity
D.doings
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9.It is generally considered unwise to give a child ____ he or she wants.
A.however
B.whatever
C.whichever
D.whenever
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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
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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
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12.She is an easy-going girl. _________ you meet her, she will smile to you.
A.As
B.Everything
C.While
D.Since
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13.The new English book I bought yesterday (_______) me almost twenty yuan.
A.spent
B.paid
C.cost
D.owned
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14.Let's go by car. It's _______.
A.cheap a lot
B.cheap much
C.more cheap
D.much cheaper
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15.Image clarity on a computer screen is measured with _____.
A.screen size
B.dot pitch
C.resolution
D.color depth
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16.The Buck(降压式变换器) is a ( ) converter.
A.voltage step-up
B.current step-down
C.current step-up
D.resistance
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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
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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
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19.Her eyes were filled (_______) tears.
A.of
B.with
C.in
D.along
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20.

A.solid particle   
B.SO2
C. CO  
D. water vapour
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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
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22.They have lessons every day (_______) Saturday.
A.except
B.except for
C.except that
D.besides
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23.I’ll make every (_______) to help you.
A.way
B.means
C.method
D.effort
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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
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25.The unit of logarithm of the magnitude of a transfer function is _____.
A.radians per second
B.volts
C.decibel
D.octaves
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26.The teacher advised Joe to___before deciding to quit school.
A.think about
B.think twice
C.think up
D.think over
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27.The red rose is her (_______) .
A.favor
B.favorite
C.like
D.best
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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
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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
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30.It was on the beach (_______) Miss White found the cat lying dead.
A.where
B.which
C.on which
D.that
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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
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32.She would make a teacher far (_______) to the average.
A.superior
B.better
C.favorable
D.popular
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33.I have no doubt (_______) he will overcome all his difficulties．
A.which
B.what
C.that
D.If
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34.This one is not good, that one is ____.
A.more bad
B.even worse
C.still worst
D.more badly
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35.When you have difficulties in translating the article, don’t (_______) to ask me.
A.hesitate
B.hesitant
C.hesitance
D.hesitation
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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
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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
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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
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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
正确答案:false

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
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41.Must I be home before seven? --- (_______) .
A.No, you needn’t
B.No, you mustn’t
C.OK
D.no, you won’t
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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
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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
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44.The ship set out for the (_______) of the ocean depths.
A.exploration
B.explosion
C.expose
D.exposition
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45.These are all (_______) demands.
A.reasonable
B.available
C.logical
D.formal
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46.Charlie ________ here next month.
A.isn't working
B.doesn't working
C.isn't going to working
D.won't work
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47.We go to the cinema (_______) a week.
A.often
B.once
C.seldom
D.usually
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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
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49.The proposal seems quite good, but I can’t easily (_______) without all the facts.
A.join
B.judge
C.say
D.speak
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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
正确答案:false