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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

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出自：海船船员证

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