A signal of one prolonged，one short，one prolonged，and one short blast，in that order is given by a vessel（）.<br>A:engaged on pilotage duty<br>B:in distress<br>C:at anchor<br>D:being overtaken in a narrow channel

A signal of one prolonged，one short，one prolonged，and one short blast，in that order is given by a vessel（）.
A:engaged on pilotage duty
B:in distress
C:at anchor
D:being overtaken in a narrow channel

出自：海船船员证

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