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| 电弧焊管 | |||
| 弧焊管 | |||
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| 弧焊管 | |||
| arc welded pipe: 12 phrases in 6 subjects |
| Architecture | 2 |
| Bridge construction | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 4 |
| Steel production | 1 |
| Technology | 2 |
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