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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（）.
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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
时间：2022-01-04 17:24
关键词：
VHF通信
答案解析
D
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