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| UOE pipe mill (【技】采用 U 成型机和0成型机成形，使用机械或水压扩管，是生产大口径直缝电焊管的主要方法。) | |||
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| butt weld pipe mill | |||
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直缝焊管机 : 3 phrases in 1 subject |
| Metallurgy | 3 |
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