单选题A vessel towing a barge astern would show，at the stern（）.Aonly a stern lightBa towing light above the stern lightCtwo towing lights in a vertical lineDtwo white lights in a vertical line
单选题
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
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