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（）.<br>A:a floodlight<br>B:two red lights in a vertical line<br>C:a single red light<br>D:any visible lights

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

出自：海船船员证

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