（） the cylinder walls, the heat passes through them by conduction.

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• The lubricating system for the cylinder walls is different from the bearings in that the oil for former one is supplied in （） while that for latter one is （）.

  A . sufficient quantity； measured B . measured quantity；sufficient C . excessive quantity；sufficient D . the less quantity the better；the more the better

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• There were several wet（）on the wall.

  A . parts B . decreases C . patches D . deck

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• The cylinder liner forming the cylinder wall and the inside of the water jacket is called a（）

  A . dry liner B . wet liner C . jacket liner D . corrugated liner

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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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• To function properly, oil control rings used on a diesel engine piston must distribute sufficient oil to all parts of the cylinder wall and must also（）.

  A . prevent any lubricant from reaching B . prevent excessive lubrication from reaching the combustion space C . Provide metal-to-metal contact to seal the cylinder against blow-by D . assure a positive means of scraping carbon accumulation from the cylinder

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• The bore of a diesel engine cylinder describes the （）

  A . swept volume of the cylinder B . inside diameter of the cylinder C . piston displacement in the cylinder D . length of the piston stroke

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• The cylinder head, cylinder liner and （） form the combustion chamber.

  A . frame B . piston C . crankcase D . explosion plate

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• The cylinder is fitted with internal liner so that a water space is left （） the liner and the outer wall.

  A . around B . among C . in D . betwee

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• The sealing function of the piston ring is brought about by the gas pressure above and behind the piston ring, which forces it （） against the bottom of the ring groove, and （） against the cylinder wall.

  A . upwards；inwards B . upwards；outwards C . downwards；inwards D . downwards；outward

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• The cylinder covers and the liners are bolted together by means of studs （） the cylinder frames.

  A . screwing into B . being screw on C . to screw on D . screwed into

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• The cylinder oil is pumped into the cylinder (via non-return valves) when the piston rings pass the lubricating orifices during （）

  A . the upward stroke B . the downward stroke C . the power stroke D . the suction stroke

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• Oil is supplied to the cylinder wall and （） by means of mechanical lubricators.

  A . the cylinder cover B . the piston rings C . the piston crown D . the piston skirt

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• China is（）the Great Wall.

  A . on B . famous C . famous for D . famous a

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• The common method of applying oil to the cylinder walls is by means of small pump assembled in units, known as （）.

  A . mechanical lubricator B . lubrication function C . forced feed system D . bearing lubricatio

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• The starting air entering the cylinder begins when the piston（）

  A . has nearly come to the TDC B . has just past the TDC C . has nearly come to the BDC D . has just past the BDC

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• If clearance between a piston and the cylinder wall is excessive, piston slap will occurThe slap itself is caused by （）

  A . alternation of side thrust B . a breakdown of the lube oil film on the cylinder wall C . worn piston boss piston pin bearings D . fluctuating gas pressure in the combustion space

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• Because many West Germans fled to the East, the West Germany government built the Berlin Wall.( )

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• the construction of the first Great Wall

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• The Great Wall posed a barrier to the communication between the north and the south.

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• This is our classroom. It is a nice big room, The windows are big and the walls are white. There is a blackboard on the front wall. On the back wall there is a map, It's a map of China.

  There is a big desk. It is for the teacher. There are forty small desks and chairs in the room. They are for our students. Our classroom is a nice big room. A．True B．False

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• The cylinder oil is pumped into the cylinder （via non-return valves) when the piston rings

  The cylinder oil is pumped into the cylinder (via non-return valves) when the piston rings pass the lubricating orifices, during ______. A.the upward stroke B.the downward stroke C.the power stroke D.the suction stroke

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• Many foreigners （) the Great Wall as the World's 7th Wonder.

  A、look on B、look for C、look at D、look around

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• The map is（）the wall.

  A．in B．on C．from D．to

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• All at once the wall fell down before the public.（）

  A．Quickly B．Immediately C．Slowly D．Suddenly

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