... 调频制 frequency modulation system 多频制 multifrequency system 二频制 two-frequency system ...
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dual-tone multifrequency system 双音多频制
DTMF Dual-Tone Multifrequency System 双音多频制
tone multifrequency system 双音多频制
multifrequency eddy current system 多频涡流系统
multifrequency signalling system 多频信号系统
multifrequency remote control system 多频遥控制
Slow-fast system with multifrequency 多频率慢快系统
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