单项选择题

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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A.position will automatically be sent
B.position will only be sent if the vessel is making a distress call
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D.None of the above

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单项选择题When can routine communications be resumed when radio silence has been imposed?（）

A.After determining that the frequency or channel appears to be no longer in use
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单项选择题When can routine communications be resumed on a frequency or channel on which radio silence has been imposed? （）

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遇险通信

When should distress flares and rockets be used? （）