Whenever your marine radio is on，FCC Rules require you to monitor（）.<br>A:a commercial ship-to-ship channel<br>B:the last frequency that was used<br>C:the distress and calling frequency<br>D:the radio only if expecting a call

Whenever your marine radio is on，FCC Rules require you to monitor（）.
A:a commercial ship-to-ship channel
B:the last frequency that was used
C:the distress and calling frequency
D:the radio only if expecting a call

出自：海船船员证

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