A whistle signal of one prolonged，one short，one prolonged and one short blast，is sounded by a vessel（）.<br>A:at anchor<br>B:towing a submerged object<br>C:being overtaken in a narrow channel<br>D:in distress

A whistle signal of one prolonged，one short，one prolonged and one short blast，is sounded by a vessel（）.
A:at anchor
B:towing a submerged object
C:being overtaken in a narrow channel
D:in distress

出自：海船船员证

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