單項(xiàng)選擇題Generally the gudgeon pin is fully floating in both connecting rod small end and （）.
A.the crosshead
B.the crankshaft
C.large end
D.the piston bosses
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1.單項(xiàng)選擇題Generally the function of lubrication is to form of a film of lubricant between any two surfaces that have relative （）, so that surfaces dont get touch with each other.
A.gravity
B.motion
C.ratio
D.density
2.單項(xiàng)選擇題Fuels of high quality with their earlier ignitions will cause higher （）pressure in cylinders of a diesel engine.
A.compression
B.maximum
C.rated
D.oil
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