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| I 形坡口对边焊 | |||
| 无坡口对接焊 | |||
| 平头对接焊 | |||
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| 平头对接焊缝 | |||
| 平头对接焊缝 | |||
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square butt welding : 3 phrases in 3 subjects |
| Electric machinery | 1 |
| Metallurgy | 1 |
| Plastics | 1 |
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