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滤波频率 : 22 phrases in 9 subjects |
| Artificial intelligence | 1 |
| Aviation | 2 |
| Construction | 1 |
| Electronics | 3 |
| Geophysics | 2 |
| Oil / petroleum | 3 |
| Piezoelectric crystals | 2 |
| Space | 3 |
| Technology | 5 |
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