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数 字数据采集 : 26 phrases in 10 subjects |
| Air defense | 1 |
| Aviation | 11 |
| Earth sciences | 2 |
| Electronics | 2 |
| General | 1 |
| Geophysics | 2 |
| Information technology | 1 |
| Navigation | 1 |
| Shipbuilding | 2 |
| Space | 3 |
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