The use of liners in riveted construction is eliminated by using（）.

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• When good and steady service conditions have been achieved, the running surfaces of the piston rings and cylinder liner will be（）In addition, the rings will move freely in the grooves and also be well oiled intact, and not unduly worn.

  A . hazy light B . hazy light brown C . hazy light blue D . hazy light grey

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• In a two-stroke engine, there are always a series of openings known as （）, and in some circumstances, there are also openings known as （）, in the part of the cylinder liner.

  A . scavenging air ports；exhaust ports B . inlet ports；scavenging air ports C . scavenging air ports；inlet ports D . exhaust ports；inlet port

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• The film of oil between the rings and the liner is not only essential for the lubrication but also plays an important part in achieving （）.

  A . an oil seal B . removing heat C . a gas seal D . cooling the pisto

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• In order to distribute the side pressures over a wide area of the cylinder walls and liners, which of the listed types of pistons are used in modem low pressure air compressors?（）

  A . Differential B . Trunk C . Barrel D . Valve-in-head

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• Which of the following is NOT used in the author＇s presentation of his ideas?

  A . Thesis statement B . Rhetorical questions C . Specific examples D . Direct quotation

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• Which of the following operation will have a direct impact on the rate of wear in a cylinder liner （）

  A . amount of scavenge air to the cylinder B . quality of fuel injected C . viscosity of the lube oil D . compression ratio of the pisto

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• The ports are drilled in the liners at an angle of approx 20℃ the result being that （） is given a rotary movement.

  A . the scavenging air B . the exhaust gases C . the mixed air D . the spray oil

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• Magnets in the binnacles of magnetic compasses are used to reduce the effect of（）.

  A . deviation B . variation C . local attraction D . All of the above

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• The microsecond unit of time is used in radar applications. The microsecond represents which of the following?（）.

  A . one-millionth part of a second B . one-thousandth part of a second C . one-hundredth part of a second D . one-tenth part of a second

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• One of the advantages in the use of a dry liner over a wet liner is（）

  A . it is fitted with neoprene O-ring seals B . the honing process makes it easier to maintain the desired oil film C . there is likelihood of water leaking into the combustion space D . it fits more loosely due to a decrease in heat transfer through the composite wall

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• The distance between rivets in a row is known as the（）.

  A . arm B . pitch C . gage D . rivet distance

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• One advantage of dry cylinder liners used in a diesel engine is the（）

  A . lower thermal expansion rates than wet liners B . greater heat transfer rate than wet liners C . greater wear resistance than wet liners D . procedure to replace dry liners is simpler than for wet liner

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• Because of the resulting higher pressures in the cylinder from the combustion of this greater mass of fuel, and the larger diameters, the liner must be made （） at the top to accommodate the higher stresses, and prevent cracking of the material.

  A . thinner B . thicker C . smoother D . rougher

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• In a diesel engine, an integral liner is one in which the cooling water （） Ⅰ.flows through the cylinder liner jackets Ⅱ.touches the outer side of the liner

  A . Ⅰ only B . Ⅱ only C . both Ⅰ and Ⅱ D . neither Ⅰ and Ⅱ

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• An important advance in the philosophy of NC of machine tools was the shifttoward the use of controller units instead of computers in NC systems

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• Vitamin B enables the body tofull use of the food taken in.

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• Which of the following uses of nanotechnology is NOT mentioned in the passage？

  A To make beauty products and dirt-resistant clothing. B To produce better and lighter building materials. C To help more accurately diagnose diseases. D To help more effectively treat diseases.

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• Which of the following is NOT used in the discussion of Rosenblatt's book？

  A．Personal opinion. B．Definition of terms. C．Specific examples. D．Comparison and contrast.

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• One advantage of dry cylinder liners used in a diesel engine is the_________.

  A.lower thermal expansion rates than wet liners B.greater heat transfer rate than wet liners C.greater wear resistance than wet liners D.procedure to replace dry liners is simpler than for wet liners

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• The ports are drilled in the liners at an angle of approx20℃ the result being that _____ is given a rotary movement.

  A.the scavenging air B.the exhaust gases C.the mixed air D.the spray oil

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• The secret of flight did not lie in the making of wings, but in discovering the right kind of power, and how to use it.

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• 9：Which of the following might be the result from the use of efficient technology in corporations？

  A.The quantity of products will be considerably increased. B.The cost of computers will be decreased. C.The per document cost of information processing will be reduced. D.The newest information will be easier to obtain.

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• In cognitive terms, _____ is the use of elements of subject's situatedness to designate something in the scene.

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• The“Americansystem”of mass production was first used in（）

  A．carindustry B．textile industry C．firearms industry D．agriculture

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