Continuous sounding of a fog whistle by a vessel is a signal（）.<br>A:that the vessel is anchored<br>B:to request the draw span of a bridge to be opened<br>C:of distress<br>D:that the vessel is broken down and drifting

Continuous sounding of a fog whistle by a vessel is a signal（）.
A:that the vessel is anchored
B:to request the draw span of a bridge to be opened
C:of distress
D:that the vessel is broken down and drifting

出自：海船船员证

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