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Dual Tone Multi Frequency | |||
dual-tone multi-frequency | |||
dual-tone multifrequency | |||
dual-tone multiple frequency | |||
dual tone multi-frequency; dual tone multifrequency | |||
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dual-tone multifrequency system |
双音多频 : 3 phrases in 2 subjects |
Aviation | 1 |
Telecommunications | 2 |