When should distress flares and rockets be used? （）<br>A:Immediately upon abandoning the vessel<br>B:Only when there is a chance of their being seen by a rescue vessel<br>C:At one hour intervals<br>D:At half hour intervals

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

出自：海船船员证

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