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Which condition represents the appropriate time for setting off distress flares and rockets? （）

A.At one hour intervals
B.At half hour intervals
C.Only when there is a chance of their being seen by rescue vessels
D.Immediately upon abandoning the vessel

單項選擇題

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