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中频 放 大器 : 30 phrases in 10 subjects |
| Air defense | 7 |
| Business | 1 |
| Communications | 1 |
| Earth sciences | 1 |
| Electronics | 2 |
| General | 4 |
| Geophysics | 1 |
| Information technology | 1 |
| Space | 6 |
| Technology | 6 |
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