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焊管钢 : 83 phrases in 10 subjects |
| Architecture | 3 |
| Bridge construction | 1 |
| General | 1 |
| Hydraulics | 1 |
| Hydroelectric power stations | 1 |
| Metallurgy | 40 |
| Oil / petroleum | 3 |
| Skydiving | 1 |
| Steel production | 1 |
| Technology | 31 |
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