The major source of chemical contaminants in hydraulic fluid is （）.
A . microscopic steel shavings
B . abrasive waste
C . anti-oxidant compounds
D . oxidation by-product
相似题目
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The INMARSAT consists of（）major components.
A . 4
B . 9
C . 8
D . 5
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In cleaning up an oil spill, the use of chemical agents would （）.
A . absorb the oil for easy removal
B . remove the oil from the water
C . disperse or dissolve the oil in the water
D . not affect the oil
-
Eventually chemical changes（）the generation of petroleum.
A . hand in
B . give in
C . take in
D . result i
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The use of sinking and dispersing chemical agents for removal of surface oil is（）.
A . the most common method used in the United States
B . too expensive for common use
C . generally safe to sea life
D . authorized only with prior approval of the Federal On-Scene Coordinator
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A major source of population growth is（）
A . immigration
B . baby boom
C . rising birth rate
D . larger number of young people
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What are two major sources of delay that can be managed by QoS in voice-enabled networks？（）
A . propagation delay
B . voice packet serialization delay
C . congested egress queues
D . header overhead
E . packets dropped because of CRC error
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What is the major function of the Parliament?
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The majority of cargo gear breakdowns are a result of（）.
A . Guy failures
B . Topping lift failures
C . Bending of the boom from compression
D . Gooseneck failure
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For the romantics, ______ is not only the major source of poetic imagery, but also provides the dominant subject matter.
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In the case of the fur trade in Canada, __________is a major source of products.
A、lion
B、tiger
C、beaver
D、leopard
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What are the three major variations of the External Narrator?
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What is the author’s impression of the majority of New York cabdrivers?
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What is one of the major sources of confusion, misunderstanding and frustration in cross-cultural communication?
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According to the author, the use of chemicals and fertilizers___________.
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The name of beneficiary should ______ “Shandong Chemicals I/E Company”.
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There is a chemical cross-linking in the network of thermoplastic rubbers.
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The productions manufactured by Asahi Chemical, Japan's largest polystyrene manufacturer take up of the market.
A．12%
B．25%
C．26.6
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________ are a specialized means of shipping petroleum, natural gas, and chemicals from sources to markets.
A、 Air tunnels
B、 Rail flatcars
C、 Steam ships
D、 Pipelines
E、 Airlines
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The major forms of NTB are___.
A、quotas
B、voluntary export quotas
C、foreign exchange control
D、state monopoly
-
In the chemical equation shown in the passage, the carbon in CO2 becomes part of which of the following types of molecules？
A.Fat
B.Sugar
C.Protein
D.Nucleic acid
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We cannot explain all romantic decisions on the basis of chemical processes.
A．YES
B．NO
C．NOT GIVEN
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听力原文： Most industrialized nations have gone through two major energy transitions. By energy transition we mean a change from one major source of energy to another.
The first major energy transition was from wood to coal. For many centuries people used wood as a primary source of energy. By burning wood people were able to heat their homes, cook their food, and produce basic items. Most early societies grew up near a sufficient supply of wood. The main advantage of wood was that it was easy to get and easy to bum.
During the early 1800's, some towns and villages began to make a transition from wood to coal as a basic source of energy, because they found that coal generally burns longer and at a higher temperature than wood, and a long-burning and hot-burning fuel was badly needed for the machines that were being used at that time. Another advantage of coal was that there was a lot of it and it was also easy to get. Besides, it could be easily shipped to faraway places.
As a result of the transition from wood to coal, industry developed very rapidly. People were able to get more things and their standard of living went up.
The second major energy transition was from coal to oil. We'll discuss it next week.
Why did most early societies grow up near a sufficient supply of wood？
A．Because wood was safer than coal.
B．Because wood burned longer than coal.
C．Because there was more wood than coal.
D．Because they used wood as primary source energy.
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One of the following is not one of the world’s major ocean basins（）
A．Atlantic Ocean
B．Arctic Ocean
C．Indian Ocean
D．Antarctic Ocean
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The equation shows that the slope of a plot of chemical potential against pressure is equal to the molar volume of the substance. An increase in pressure raises the chemical potential of any pure subs
A．To raise the melting temperature slightly．
B．To lower the melting temperature slightly．
C．Negligibl
E．No effect at all．
D．None the above
