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The purpose of the wearing rings used in a centrifugal pump is to （）.
A . prevent an internal explosion in the pump when it is overheated
B . enable a visual inspection of the pump while it is running
C . insure a proper alignment of the pump coupling to the driver
D . accommodate for friction between the impeller and the easing
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A distinguishing feature of an educator, when compared to other pumps, is the （）.
A . dischargeendbeingsmallerthanthesuctionend
B . smallsizeofimpeller
C . lackofmovingparts
D . easeatwhichthewearingringsmaybechanged
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The function of a centrifugal pump double volute casing is to （）.
A . reduce radial thrust to the impeller
B . double the liquid velocity through the pump when compared to a single volute
C . reduce hydraulic end thrust
D . provide the effect of multi-staging
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In a pneumatic automation system, a unit producing a signal to govern the position of the controller of the measured variable, relative to the value of the measured variable, is said to have（）.
A . reset action
B . proportional action
C . two position action
D . rate actio
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Which timing mode is appropriate for a SONET NE that is adjacent to a SONET NE using BITS-1 timing source?（）
A . DUS
B . line timing
C . loop timing
D . internal timing
E . through timing
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The simplest method to use for determining if a centrifugal pump is operating as designed, is to （）.
A . closely observe the pump discharge temperature
B . close off the discharge valve, and watch for a rise in pressure
C . momentarily close off the suction valve, and watch for a rise in pressure
D . use a clamp on ammeter and compare the readings to past record
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The control rod of a steering gear pump is attached at its outer end to （）.
A . the hunting gear
B . the rudder stock
C . the rudder controller
D . the feedback unit
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Said cargo spaces having been cleaned in accordance with the Regulations and the recommendations of the (US) National Cargo Bureau，Inc. This wording is likely to appear in （）.
A . CERTIFICATE OF CLEANLINESS
B . FUMIGATION AND GAS FREE CERTIFICATE
C . CERTIFICATE OF CLASS
D . INTERNATIONAL OIL POLLUTION PREVENTION CERTIFICATE
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With reference to a radial piston pump, which one of the following statements is false?（）
A . Surrounding the fixed shaft is a hollow shaft
B . This hollow shaft carries radial bores
C . Each bore is fitted with a well-lapped plunger
D . There are always even numbers of bore
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0ne function of a hulwark is to（）.
A . help keep the deck dry
B . prevent stress concentrations on the stringer plate
C . protect against twisting forces exerted on the frame of the vessel
D . reinfo ce th eside stringer
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The cleaned heated oil, after passing through the centrifuges, is to be pumped to a （）.
A . settling tank
B . service tank
C . ballast tank
D . drain tank
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Your vessel is taking on fuel oil when a small leak develops in the hose and you have ordered the pumping stoppedBefore resuming pumping，you should（）.
A . notify the terminal superintendent
B . place a large drip pan under the leak and ping the scuppers
C . repair the hose with a patch
D . replace the hose
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English Romanticism is generally said to have begun with __________ in 1798.
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John said that he ______ Paris three times.A. has been to B. had gone toC. had been to D. have gone to
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“This light is too ________ for me to read by. Don’t we have a brighter bulb some where”; said the elderly man.
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1．The man is reported to have said in private that "we are being made fools of by many of our clients, so we are entitled to have them bow to us as compensation."
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“This light is too ______for me to read by. Don’t we have a brighter bulb some where”; said the elderly man.
A)mild B)dim C)minute D)slight
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With a profound sadness I have just said farewell to one of my best friends who is now lost to me forever. He has bought a television set.
The man who buys a television set departs from the world of living men and enters another word of shadows. I do not blame my friend. The real world, I suppose, is just too much for him as it is for millions of others.
My friend does not realize, of course, that he is in full retreat from actuality. He supposes, on the contrary, that he is boldly advancing into the fierce current of these times by bringing the world, with all its events and human figures, into his living room. That is the great current illusion. The shadows are mistaken for things.
Now, television is a wonderful invention. I have no word to say against it, so long as it is confined to other people's houses where, in my weaker moments, I may see it occasionally free. But it brings no one closer to life. It merely inter- poses a gaudy curtain between lift and the spectator. It is only the latest gadget contrived by thoughtful men to make sure that nobody does any real thinking for himself.
My friend will answer that he will now receive the best thoughts of the ablest minds in the world and see their faces as they deliver them. He will see events as they unfold at first hand, with a time lag of half a second or less.
Of course, he will. But he won't understand anything better. He will understand less than ever. For the grim, inescap- able fact of human understanding is that it must be private, must come from within and cannot be plastered on like stucco from the outside. A man may secure knowledge from others. He will never secure understanding. Though it is presented in a million different versions, the paramount problem of modern man is to find a satisfactory participation in modern life. And it is there that he is most obviously failing.
He can turn a screw on the assembly line, but as the finished automobile comes off at the end, he has no satisfaction in its creation. Or if he works in a white collar he can add up all the figures of business on an adding machine without once touching the realities a life as the country storekeeper touches them. He swarms in his multitudes to watch hockey game but he does not play hockey.
In other words, for the essential purposes of life, modern man is becoming a spectator, not a participant, a customer not a creator, a consumer in the main and only incidentally a producer. Thus by a law as old as Eden he becomes sick under a hectic outward flush. His physical diet is better than ever but he sickens by a secret malnutrition of the soul.
According to the author, his friend has bought a television in order to_____.
A．know the current events
B．entertain himself at leisure time
C．escape from the reality
D．kill time
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When the air in a certain space is squeezed to occupy a smaller space, the air is said to be ______.
A．commenced
B．compressed
C．compromised
D．compensated
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A market is said to be informational efficient if it features:
A、Market prices that reflect all available information about the value of the securities traded.
B、Timely and accurate information about current supply and demand conditions.
C、Many buyers and sellers that are willing to trade at prices above and below the prevailing market price.
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听力原文：W: It is said that you have made a new pretty girlfriend. And we're having a party tonight. Why not join us together with your girlfriend？
M: Well.. .I'm breaking up with Cathy.
Q: What does the man mean？
(17)
A．He has his leg broken.
B．He wants to join the party.
C．He parts with his girlfriend.
D．He gets along well with Cathy.
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One day one of them said to the king. "After much thought and study. I have found out that Ihert. is only one way for you to get well. You must wear the shirt of a happy ]nail. "
So Ihe king sent his men to every part of his land to look for a happy man. First they visited me rich They asked all thesepeoplethesamequostion. "Arc you happy？" Bul every one of them answcred. "No. 1 don't know what real happiness means. "
One day nile of the king's men mci a woodcutter (伐木工)
"Are you happy？" asked die king's man.
"As happy as the day is long. " answered Ibc woodcutter.
"Oh. goodt" said the man. "Give me your shirt. "
"Why？" said Ibe woodculter. "I beven'l got one. "
The king wasn't happy because he wtm ill.
A．True.
B．False.
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When the relief valve is used as a constant pressure valve, it is connected to the outlet of the hydraulic pump to ensure that the outlet pressure of the hydraulic system (pump) is constant.
A:正确;
B:错误
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A firm is said to have a top-heavy capital structure if a high percentage of its total capital is:
A、Senior debt.
B、short-term debt.
C、Secured bank debt.
