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---Stand by engine!
---Reply: Stand by engine!
---Report: （）.

A. Stand by
B. Stand by engine
C. Engine stand by
D. OK

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Stand by engine. （）

A. Get the engine ready.
B. Ring off engine.
C. Stop engine.
D. Stand on it.

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The duty （） should do the cleaning work every morning.

A.officer
B.motorman
C.sailor
D.engineer