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infrasonic frequency | |||
infra-acoustical frequency; infrasonic frequency (率); subsonic frequency | |||
infra-acoustic frequency; undersonic frequency | |||
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infrasonic frequency |
次声频 : 12 phrases in 6 subjects |
General | 1 |
Geophysics | 1 |
Information technology | 1 |
Oil / petroleum | 2 |
Otorhinolaryngology | 1 |
Technology | 6 |