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

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

出自：海船船员证

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