单选题What should you do if you have transmitted a distress call a number of times on channel 16 and have received no reply?（）ARepeat the message using any other channel on which you might attract attentionBKey the microphone several times before transmitting againCTurn up the volume on the receiver before transmitting againDReport the problem to the head electrician
单选题
What should you do if you have transmitted a distress call a number of times on channel 16 and have received no reply?（）
A
Repeat the message using any other channel on which you might attract attention
B
Key the microphone several times before transmitting again
C
Turn up the volume on the receiver before transmitting again
D
Report the problem to the head electrician
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