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闭 区 : 75 phrases in 11 subjects |
| Agriculture | 1 |
| Electronics | 8 |
| General | 31 |
| Geology | 1 |
| Information technology | 1 |
| Mathematics | 5 |
| Metallurgy | 1 |
| Military | 1 |
| Oil processing plants | 1 |
| Rail transport | 8 |
| Technology | 17 |
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