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
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相关考题
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单项选择题
A safe water daymark has what shape? （）
A.Triangular
B.Diamond
C.Circular
D.Octagonal -
单项选择题
A red triangular daymark marks（）.
A.the centerline of a navigable channel
B.the starboard side of a channel
C.a prominent object of navigational interest that has no lateral significance
D.area of a channel where passing another vessel is permitted -
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
