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For a L√Opurifier, if the back pressure of the oil outlet is too high, the interface between oil and water in the bowl will （）.
A . be interrupted
B . move downwards
C . move outwards
D . retain original positio
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In a refrigeration system, if the cooling water to the condenser fails, the（）.
A . box temperature solenoid valve will close
B . expansion valve will close
C . compressor will shutdown
D . king valve will ope
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If a small electric motor is immersed in salt water it should be （） (1) washed in fresh water (2) dried in an oven
A . (1) only
B . (2) only
C . both (1) and (2)
D . neither (1) or (2)
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The diameter of the gravity disc is too big It causes oil to flow through the water outlet We changed the disc and no （） is found in the water outlet.
A . water
B . oil
C . scale
D . ridge
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During the running of the diesel engine, if the supply of cooling water is interrupted or the temperature of cooling water out of the cylinder is too high, the duty engineer should （）
A . notify the duty officer, reduce the engine speed, take some measures to remove failures
B . notify the duty officer and stop the engine immediately, find the cause and remove failures
C . notify the C/E
D . notify the captai
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The EMPLOYEES table is stored in the USERS tablespace. You need to check if the EMPLOYEES table is affected by the block corruption found in the USERS tablespace. Which option would you use？（）
A . the DBNEWID utility
B . the ANALYZE command
C . the RMAN LIST command
D . the RMAN REPORT command
E . the RMAN CROSSCHECK command
F . the RMAN BLOCKRECOVER command
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If you detect oil in the water around your vessel while discharging fuel, the FIRST thing to do is（）.
A . try to find out where the oil is coming from
B . call the Master
C . have the pump man check the discharge piping
D . shutdown operatio
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There is（）water in the glass, is there?
A . a few
B . not
C . few
D . little
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A current will develop between areas of different density in ocean waters. If you face in the same direction the current is flowing，the water of（）.
A . high density will be on the left in the Northern Hemisphere
B . high density will be on the right in the Southern Hemisphere
C . low density will be on the left in the Northern Hemisphere
D . low density will be on the left in the Southern Hemisphere
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When issuing the CROSSCHECK command in RMAN， if a backup file CANNOT be found， to what status is that file set？（）
A . DELETED
B . OBSOLETE
C . EXPIRED
D . UNKNOWN
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If any cargo is found not in good order，（）.
A . it is usually cancelled
B . its bill of lading not signed
C . the shipper pays for it
D . a remark is made for it
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As for an oil-fired boiler if at a normal steaming condition and water goes out of sight in gauge glasses the action you should take is: （） (1) secure oil to fires (2) increase feed pump pressure
A . （1）
B . （1）and（2）
C . （2）
D . neither（1）nor（2）
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If the property has been put in a specific location purposefully and inadvertently left there,the owner of the real property on which it is found generally has the right to the item.
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Whena pencil is partly in a glass of water, it looks as if it____
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When a pencil is partly in a glass of water, it looks as if it ( ).
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In C language, the result of the logical ______ operator is 1 if the value of its operand is 0,0 if the value ofits operand is non-zero.
A．AND B．NOT C．OR D．EOR
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If a substance is dissolved in water or heated, it may-______ a gas.
A．give into
B．give over
C．give off
D．give away
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Are you the kind of person who likes staying in unusual places？ If the answer is "yes", then try the world's coldest hotel in Jukkasjarvi in the north of Sweden. But go in winter or all you'll find is a pool of water, because the hotel melts every spring!
The man who runs the Attic Hall Hotel is Nils Yngve Bergqvist. He built his first ice building for an art exhibition in 1991 and he designed the present hotel—over 200 meters square—himself. It took workmen about two months to pile 1,000 tons of snow onto a wooden base. As the weather got colder, the snow froze and then they removed the base. The whole building and everything in it are made of snow—except for the wooden front door. There's a theatre which Nils uses for a jazz club, a radio station and a large ice bar. As you can imagine, hot drinks are popular with the guests! The rooms have no doors; there's no furniture, no heating and everyone sleeps on ice beds. But the 800 people who stayed at the hotel this winter seemed to like it. If you want to stay in one of the ten ice rooms, it will cost you about ￡30 a night. You will receive a survival certificate from the manager.
When the winter's over, Nils holds his annual contest to predict the day that the hotel will fall. The person that guessed the day correctly last year receives a large painting from an ARTic Hall exhibition. Nils's ice hotel is becoming world-famous and he loves his work.. He's already excited about his next project — an ice hotel that will have more complicated architectural features and, he says, will be bigger and better.
What do we know about the Artic Hall Hotel？
A．It is completely made of snow.
B．It is designed by Nils's friend.
C．It is built once a year.
D．It has a wooden base.
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For a L.Opurifier, if the back pressure of the oil outlet is too high, the interface between oil and water in the bowl will _____.
A.be interrupted
B.move downwards
C.move outwards
D.retain original position
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As for an oil-fired boiler if at a normal steaming condition and water goes out of sight in gauge glasses the action you should take is: (1) secure oil to fires; (2) increase feed pump pressure.
A.(1)
B.(1) and (2)
C.(2)
D.neither (1) nor (2)
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Man depends on water for many things. He needs it for drinking. He needs it for growing food. He needs it for keeping himself clean and free from illness. He needs more and more water for industry. People often forget how necessary water is for industry. Imagine, for example, the immense quantities of water used by the great cooling towers of steel works. The demand for water is growing every day. It is closely connected with the increasing population and with the pressing problem of providing enough food. But the world has not yet found ways of storing enough water to satisfy all these important needs, not even in west countries like England. Great efforts are being made today to store water, particularly in hot countries where the rainfall is small.
Three-quarters of the world is covered with water. But only three percent of this water is fresh. All the rest is salt, and fills the oceans and the great inland seas. It is the salt that makes sea water useless to man. If you take the salt away the water can be used for drinking and for watering plants.
In 1962 President John Kennedy of the United States said, "When man discovers how to mm salt water into fresh water cheaply, he will have made a much more important scientific advance than when he first landed on the moon".
Human beings need water for【46】,【47】and【48】and【49】.
Main idea: The【50】
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It is hard to predict how science is going to turn out, and if it is really good science it is impossible to predict. If the things to be found are actually new, they are by definition unknown in advance. You cannot make choices in this matter. You either have science or you don't, and if you have it you are obliged to accept the surprising and disturbing pieces of information, along with the neat and promptly useful hits,
The only solid piece of scientific truth abut which I feel totally confident is that we are profoundly ignorant about nature. Indeed, I regard this as the major discovery of the past hundred years of biology. It is, in its way, an illuminating piece of news. It would have amazed the brightest minds of the 18th. century Enlightenment to be told by any of us how little we know and how bewildering seems the way ahead. It is this sudden confrontation with the depth and scope of ignorance that represents the most significant contribution of the 20th century science to the human intellect. In earlier times, we either pretended to understand how things worked or ignored the problem, or simply made up stories to fill the gaps. Now that we have begun exploring in earnest, we are getting glimpses of how huge the questions are, and how far from being answered. Because of this, we are depressed. It is not so bad being ignorant if you are totally ignorant; the hard thing is knowing in some detail the reality of ignorance, the worst spots and here and there the not-so-bad spots, but no true light at the end of the tunnel nor even any tunnels that can yet be trusted.
But we are making a beginning, and there ought to be some satisfaction. There are probably no questions we can think up that can' t be answered, sooner or later, including even the matter of consciousness. To be sure, there may well be questions we can't think up and therefore limits to the reach of human intellect, but that is another matter. Within our limits, we should be able to work our way through to all our answers, if we keep at it long enough, and pay attention.
According to the author, really good science ______.
A．would surprise the brightest minds of the 18th century Enlightenment
B．will help people to make the right choice in advance
C．will produce results which cannot be foreseen
D．will bring about disturbing results
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After some water reducing agent is used into concrete, the function of the agent is（）if some water is reduced
A．to improve concrete mechanics
B．to reduce concrete cost
C．to change concrete workability
D．to increase concrete flowability
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10、金属框下端全没入水中，即使金属框略倾斜也不会影响表面张力的大小。 The lower end of the metal frame is completely submerged in the water, even if the metal frame is slightly inclined, The size of surface tension will not be affected.
