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电子聚焦 : 19 phrases in 10 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Electronics | 8 |
| General | 2 |
| Geology | 1 |
| Geophysics | 1 |
| Metallurgy | 2 |
| Shipbuilding | 1 |
| Space | 1 |
| Technology | 1 |
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