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| 右焊法; 反手焊 | |||
| 反向焊; 后退焊 | |||
| 右旋转焊接; 右向焊接; 反手焊接 | |||
| 右向焊; 后退焊 (接); 后倾焊向右焊; 反手焊 (接) | |||
| backward welding: 2 phrases in 1 subject |
| Oil / petroleum | 2 |
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