单选题When a vessel signals her distress by means of a gun or other explosive signal，the firing should be at intervals of approximately（）.A10 minutesB1 minuteC1 hourD3 minutes
单选题
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
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