单项选择题

A vessel engaged in trawling will show identification lights of（）.

A.a red light over a white light
B.a white light over a red light
C.a green light over a white light
D.two red lights in a vertical line

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单项选择题

A.a vessel restricted in her ability to maneuver
B.a vessel not under command
C.a vessel constrained by her draught
D.a vessel not under way

单项选择题

A.under sail
B.restricted in her ability to maneuver
C.crossing a channel
D.All of the above

单项选择题

A.white
B.green
C.red
D.yellow