单选题By night，you sight the lights of a vessel engaged in underwater operations. If an obstruction exists on the port side of the vessel，it will be marked by（）.Aa floodlightBtwo red lights in a vertical lineCa single red lightDany visible lights
单选题
By night，you sight the lights of a vessel engaged in underwater operations. If an obstruction exists on the port side of the vessel，it will be marked by（）.
A
a floodlight
B
two red lights in a vertical line
C
a single red light
D
any visible lights
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