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| 躺焊 | |||
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| 躺焊 | |||
| 躺焊法; 卧式半自动焊按法; EH 焊接法以奥地利 Elin 公司 Hafergut于1933年发表的方法命名 | |||
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fire cracker welding : 2 phrases in 1 subject |
| Technology | 2 |
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