When a vessel signals her distress by means of a gun or other explosive signal，the firing should be at intervals of approximately（）.<br>A:10 minutes<br>B:1 minute<br>C:1 hour<br>D:3 minutes

When a vessel signals her distress by means of a gun or other explosive signal，the firing should be at intervals of approximately（）.
A:10 minutes
B:1 minute
C:1 hour
D:3 minutes

出自：海船船员证

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