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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 | |||
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次声频 : 12 phrases in 6 subjects |
| General | 1 |
| Geophysics | 1 |
| Information technology | 1 |
| Oil / petroleum | 2 |
| Otorhinolaryngology | 1 |
| Technology | 6 |
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