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| ultrasonic wave frequency | |||
| super-audio; supra acoustic frequency; ultrasonic frequency | |||
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超声波频 : 19 phrases in 7 subjects |
| Business | 1 |
| Electronics | 1 |
| Geophysics | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 1 |
| Technology | 12 |
| Water resources | 1 |
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