单选题When should you use 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
When should you use 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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