... voice frequency system 话频制 voice frequency telegraphy 音频电报 voice quality 声音品质 ...
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voice frequency telegraphy equipment 音频电报设备
Voice-frequency telegraphy on radio circuits 无线电路上的音频电报
multi-channel voice-frequency telegraphy 多路音频电报
single channel voice frequency telegraphy 单路音频电报
voice-frequency carrier telegraphy 音频载波电报术
voice frequency multi-channel carrier telegraphy 音频多信道载波电报
voice-frequency multiplex telegraphy 音频复用电报
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