单项选择题

A vessel trawling will display a（）.

A.red light over a white light
B.green light over a white light
C.yellow light over a red light
D.white light over a green light

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单项选择题

A vessel traveling down a narrow channel，especially if the draft is nearly equal to the depth of the water，may set off the nearer side. This effect is known as（）.

A.smelling the bottom
B.squatting
C.bank suction
D.bank cushion

单项选择题

A vessel towing astern in an operation which severely restricts the towing vessel and her tow in their ability to change course shall，when making way，exhibit（）.

A.the masthead lights for a towing vessel
B.the lights for a vessel restricted in its ability to maneuver
C.sidelights，stern light and towing light
D.All of the above

单项选择题

A vessel towing a barge astern would show，at the stern（）.

A.only a stern light
B.a towing light above the stern light
C.two towing lights in a vertical line
D.two white lights in a vertical line