单选题When should distress flares and rockets be used? （）AImmediately upon abandoning the vesselBOnly when there is a chance of their being seen by a rescue vesselCAt one hour intervalsDAt half hour intervals
单选题
When should distress flares and rockets be used? （）
A
Immediately upon abandoning the vessel
B
Only when there is a chance of their being seen by a rescue vessel
C
At one hour intervals
D
At half hour intervals
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