单项选择题

---How many revolutions?
---（）.

A. Slow ahead
B. Eighty
C. Thirty minutes
D. Slow

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单项选择题

---Dead slow ahead!
---Reply: （）.
---Report: Engine dead slow ahead.

A. No problem
B. OK
C. Dead slow ahead
D. Yes

单项选择题

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

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

单项选择题

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