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

A.position will automatically be sent
B.position will only be sent if the vessel is making a distress call
C.MMSI will indicate its ocean region
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
B.After determining that geographic distance from the distress situation will prohibit any other signal from interfering with emergency communications
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

单项选择题

When can routine communications be resumed on a frequency or channel on which radio silence has been imposed? （）

A.After determining that the frequency or channel appears to be no longer in use
B.After determining that geographic distance from the distress situation will prohibit any other signal from interfering with emergency communications
C.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.Routine communications can resume if，in the Master's opinion，communications on that frequency or channel will not interfere with emergency communications

单项选择题

When a vessel signals her distress by means of a gun or other explosive signal，the firing should be at intervals of approximately（）.

A.10 minutes
B.1 minute
C.1 hour
D.3 minutes

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