What is the MOST important thing you should do before transmitting on a marine radio? （）<br>A:Ask for permission<br>B:Record the time in your radio log<br>C:Press the push to talk button three times<br>D:Monitor the channel to insure that it is clear

What is the MOST important thing you should do before transmitting on a marine radio? （）
A:Ask for permission
B:Record the time in your radio log
C:Press the push to talk button three times
D:Monitor the channel to insure that it is clear

出自：海船船员证

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