When can routine communications be res

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

AAfter determining that the frequency or channel appears to be no longer in use
BAfter determining that geographic distance from the distress situation will prohibit any other signal from interfering with emergency communications
CAfter the Rescue Coordination Center transmits a message on the frequency or channel being used for emergency communications stating that such traffic has concluded
DRoutine communications can resume if，in the Master's opinion，communications on that frequency or channel will not interfere with emergency communicatio

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分类：遇险通信题库

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