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| 对头焊接法 | |||
| 对接焊法 | |||
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| 对头焊接法; 对头焊法; 对接焊法 | |||
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| 对头焊接法 (管材的) | |||
| butt welding process: 2 phrases in 1 subject |
| Metallurgy | 2 |
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