All fog signals shall be sounded every two minutes with the exception of a vessel（）.<br>A:underway or making way<br>B:under sail or under tow<br>C:anchored or aground<br>D:not under command or restricted in her ability to maneuver

All fog signals shall be sounded every two minutes with the exception of a vessel（）.
A:underway or making way
B:under sail or under tow
C:anchored or aground
D:not under command or restricted in her ability to maneuver

出自：海船船员证

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