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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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单选题When should you use distress flares and rockets?（）A
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单选题When should distress flares and rockets be used? （）A
Immediately upon abandoning the vesselB
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单选题Which channel and mode should be used when initiating a distress alert transmission（）.A
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