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單項選擇題

The mechanical efficiency of an engine （） because losses occur in the form of friction.

A.is always less than 100%
B.is always more than 100%
C.is always equal to 90%
D.is always less than 90%

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單項選擇題

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

單項選擇題

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