单项选择题

A power-driven vessel，when towing astern，shall show（）.

A.two towing lights in a vertical line
B.a towing light in a vertical line above the sternlight
C.two towing lights in addition to the sternlight
D.a small white light in lieu of the sternlight

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单项选择题

A power-driven vessel underway shall keep out of the way of（）.

A.a vessel restricted in her ability to maneuver
B.a vessel under command
C.a passenger ship
D.a seaplane on the water

单项选择题

A power-driven vessel towing another vessel astern (tow less than 200 meters) shall show （）.

A.three masthead lights in a vertical line instead of either the forward or after masthead light
B.two masthead lights in a vertical line instead of either the forward or after masthead lights
C.two towing lights in a vertical line at the stern
D.a small white light aft of the funnel

单项选择题

A power-driven vessel shall have her engine ready for（）when the visibility is restricted.

A.immediately stop
B.immediately maneuvering
C.immediately anchoring
D.immediately going astern