单选题A single towing light will be carried above a vessel’s sternlight（）.Aonly if she is towing asternBonly if the tow exceeds 200 metersCat any time when towingDif the towing vessel is part of a composite unit
单选题
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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