单项选择题

驾驶台始终有驾驶员值班。（）

A. Sailors are always on watch on the bridge.
B. Deck officers are always on watch on the bridge.
C. Sailors are never on watch on the bridge.
D. Deck officers are never on watch on the bridge.

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单项选择题

后退一！（）

A. Full ahead!
B. Slow astern!
C. Half astern!
D. Dead astern!

单项选择题

后退二！（）

A. Full ahead!
B. Slow astern!
C. Half astern!
D. Ahead three!