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分 区位 : 22 phrases in 11 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Business | 1 |
| Drilling | 3 |
| General | 4 |
| Mathematics | 1 |
| Project management | 1 |
| Rail transport | 1 |
| Statistics | 3 |
| Technology | 5 |
| Telecommunications | 1 |
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