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單項(xiàng)選擇題

He said that he had turned the main engine one complete revolution with the （）.

A.turning gear
B.steering gear
C.spur gear
D.chain gear

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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

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

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