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| 换 管子: 22 phrases in 12 subjects |
| Chemistry | 1 |
| Earth sciences | 1 |
| Ecology | 1 |
| Electronics | 2 |
| General | 5 |
| Hydroelectric power stations | 1 |
| Information technology | 1 |
| Logistics | 1 |
| Metallurgy | 1 |
| Multimedia | 1 |
| Shipbuilding | 4 |
| Technology | 3 |
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