A. Slow aheadB. EightyC. Thirty minutesD. Slow---How ma……

单项选择题RPM（）

A. revolutions per minute
B. revolutions per mile
C. revolutions per month
D. very personal matter

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Stand by engine. （）

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

单项选择题The duty （） should do the cleaning work every morning.

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