单选题Which condition represents the appropriate time for setting off distress flares and rockets? （）AOnly when there is a chance of their being seen by rescue vesselsBAt half hour intervalsCAt one hour intervalsDImmediately upon abandoning the vessel
单选题
Which condition represents the appropriate time for setting off distress flares and rockets? （）
A
Only when there is a chance of their being seen by rescue vessels
B
At half hour intervals
C
At one hour intervals
D
Immediately upon abandoning the vessel
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