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單項選擇題

The following preparations are essential for any （） of marine diesel engine before it may be started.

A.doing
B.make
C.turn
D.operating

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單項選擇題

The diesel engine consumes considerably less fuel than the steam engine for equal output, （） enables a motor-ship to load more cargo.

A.why
B.which
C.in which
D.on which

單項選擇題

It was （）midnight that we removed the trouble and went back to our cabin.

A.until
B.not until
C.not before
D.not after

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