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钢筋混管 : 50 phrases in 11 subjects |
| Architecture | 1 |
| Aviation | 1 |
| Bridge construction | 7 |
| Construction | 2 |
| Earth sciences | 1 |
| Ecology | 1 |
| General | 3 |
| Hydroelectric power stations | 5 |
| Oil / petroleum | 3 |
| Rail transport | 1 |
| Technology | 25 |
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