You are underway in fog and you hear one prolonged blast followed by two short blasts.This is a vessel（）.<br>A:Towing<br>B:Engaged on pilotage duty<br>C:Aground in a fairway<br>D:Stopped and making no way through the water

You are underway in fog and you hear one prolonged blast followed by two short blasts.This is a vessel（）.
A:Towing
B:Engaged on pilotage duty
C:Aground in a fairway
D:Stopped and making no way through the water

出自：海船船员证

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