单项选择题
A.scale B.sludge C.chemicals D.air
He said that he had turned the main engine one complete...
单项选择题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
Generally the gudgeon pin is fully floating in both con...
单项选择题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
Generally the function of lubrication is to form of a f...
单项选择题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
