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單項(xiàng)選擇題

The marine diesel engine is a type of diesel engine used on ships The （） of its operation is not very difficult to understand.

A.principle
B.principal
C.cause
D.case

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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

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