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單項(xiàng)選擇題

The majority of medium speed and high speed marine diesel engines for main or auxiliary drive operate on the （） cycle.

A.two-stroke
B.four-stoke
C.long-stroke
D.short-stroke

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單項(xiàng)選擇題

The main moving parts of a diesel engine consist of the （） and the pistons.

A.bedplate, connecting rods
B.crankshaft, the connecting rods
C.frames, crossheads
D.crankshaft, the cylinder

單項(xiàng)選擇題

The main function of the lubrication system in to enable （） of a film of oil between the moving parts.

A.the information
B.the formation
C.the scatter
D.the friction

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