... multifrequency dial 多频拨号 tone multifrequency 双音色多频 multifrequency keying 多频键控 ...
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DTMF Dual Tone MultiFrequency 双音多频
dual tone multifrequency receiver 双音多频接收机
dual-tone multifrequency system 双音多频制
DTMF Dual-Tone Multifrequency Signaling 双音多频信号
Double Tone MultiFrequency 双音多频
Tone Multifrequency Signaling 双音多频信号
DTMF Dual-Tone Multifrequency System 双音多频制
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