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| constant band width filter; flat filter | |||
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宽滤波器 : 15 phrases in 7 subjects |
| Air defense | 2 |
| Electronics | 2 |
| Geophysics | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Space | 1 |
| Technology | 7 |
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