... voice frequency signal 音频旌旗灯号 voice frequency system 话频制 voice frequency telegraphy 音频电报 ...
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短语
声频电话制
acoustical telephony
话频调制
voice modulation
四线制话频电话中继器
four-wire voice frequency telephone repeater
话频多路制
[通信]
voice-frequency multichannel system
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