单选题When can routine communications be resumed when radio silence has been imposed?（）AAfter determining that the frequency or channel appears to be no longer in useBAfter determining that geographic distance from the distress situation will prohibit any other signal from interfering with emergency communicationsCRoutine 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 concludedDIf，in the Master's opinion，communications on that frequency will interfere with emergency communications
单选题
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
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