A towing vessel pushing a barge ahead and rigidly connected in a composite unit shall show the lights of（）.<br>A:a vessel towing by pushing ahead<br>B:a power-driven vessel，not towing<br>C:a barge being pushed ahead<br>D:either answer A or answer B

A towing vessel pushing a barge ahead and rigidly connected in a composite unit shall show the lights of（）.
A:a vessel towing by pushing ahead
B:a power-driven vessel，not towing
C:a barge being pushed ahead
D:either answer A or answer B

出自：海船船员证

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