A vessel sounding a fog signal of one short，one prolonged，and one short blast is indicating that the vessel is（）.<br>A:fishing<br>B:in distress<br>C:at anchor<br>D:not under command

A vessel sounding a fog signal of one short，one prolonged，and one short blast is indicating that the vessel is（）.
A:fishing
B:in distress
C:at anchor
D:not under command

出自：海船船员证

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