单项选择题

When you are firing a pyrotechnic distress signal，it should be aimed at（）.

A.straight overhead
B.at the vessel whose attention you are trying to get
C.into the wind
D.about 60 degrees above the horizon

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单项选择题When should distress flares and rockets be used? （）

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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

When sending a DSC call，the vessel’s（）.A.position will ...

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A.position will automatically be sent
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C.MMSI will indicate its ocean region
D.None of the above

When can routine communications be resumed when radio s...

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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C.Routine communications can resume after the Rescue Coordination Center transmits a message on the frequency or channel being used for emergency communications stating that such traffic has concluded
D.If，in the Master's opinion，communications on that frequency will interfere with emergency communications

遇险通信

When you are firing a pyrotechnic distress signal，it should be aimed at（）.