單項(xiàng)選擇題A vessel may exhibit lights other than those prescribed by the Rules as long as the additional lights（）.

A.do not interfere with the keeping of a proper look-out
B.are not the color of either sidelight
C.have a lesser range than the prescribed lights
D.All of the above


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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題A vessel engaged in mine clearance operations is called（）.

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