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放大 频率 : 28 phrases in 10 subjects |
| Air defense | 3 |
| Aviation | 3 |
| Communications | 1 |
| Earth sciences | 2 |
| Electronics | 4 |
| General | 2 |
| Geophysics | 1 |
| Shipbuilding | 1 |
| Space | 3 |
| Technology | 8 |
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