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增益放大器 : 51 phrases in 11 subjects |
| Air defense | 5 |
| Business | 1 |
| Earth sciences | 1 |
| Electronics | 13 |
| Geophysics | 5 |
| Information technology | 3 |
| Nautical | 1 |
| Oil / petroleum | 4 |
| Otorhinolaryngology | 1 |
| Space | 2 |
| Technology | 15 |
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