单项选择题
A towing vessel 30 meters in length is pushing barges ahead. How many white masthead lights is the vessel REQUIRED to show at night?（）
A.One
B.Two
C.Three
D.Four
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相关考题
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单项选择题
A towing light，according to the Rules，is a（）.
A.white light
B.red light
C.yellow light
D.blue light -
单项选择题
A towing light is a yellow light having the same characteristics as a(n)（）
A.special flashing light
B.anchor light
C.sternlight
D.masthead light -
单项选择题
A single towing light will be carried above a vessel’s sternlight（）.
A.only if she is towing astern
B.only if the tow exceeds 200 meters
C.at any time when towing
D.if the towing vessel is part of a composite unit
