You are making a telephone call ship-to-shore using the VHF-FM service.You can tell that the working channel is busy if you hear（）.<br>A:Speech<br>B:Signaling tones<br>C:A busy signal<br>D:All of the above

You are making a telephone call ship-to-shore using the VHF-FM service.You can tell that the working channel is busy if you hear（）.
A:Speech
B:Signaling tones
C:A busy signal
D:All of the above

出自：海船船员证

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