high-frequency telephony [通信] 高频电话学
voice-frequency telephony [通信] 声频电话学 ; 音频通话
carrier frequency telephony 载波电话 ; 载波电话学
cft carrier frequency telephony 载频电话
frequency-modulation telephony 调频电话
frequency modulated carrier current telephony 调频式载波电话
frequency-modulated carrier current telephony [通信] 调频载波电流电话
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