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| 无缝管子 | |||
| pipe seamless: 59 phrases in 10 subjects |
| Automobiles | 1 |
| Bridge construction | 1 |
| Business | 1 |
| Hydroelectric power stations | 1 |
| Metallurgy | 32 |
| Nautical | 3 |
| Rail transport | 1 |
| Shipbuilding | 1 |
| Steel production | 2 |
| Technology | 16 |
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