Which condition represents the appropriate time for setting off 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

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

出自：海船船员证

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