... voice frequency grade channel 电话信道 voice frequency system 音频系统 voice grade channel 音频级信道 ...
基于48个网页-相关网页
voice-frequency telegraph system [通信] 音频电报系统
voice frequency signaling system 音频信令系统
VFSS Voice Frequency Signaling System 音频信令系统
voice-frequency multichannel system [通信] 话频多路制
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