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| 向下立焊 | |||
| 下行焊 | |||
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| 下行立焊焊缝; 竖焊缝; 从上到下施焊焊缝 | |||
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| 垂直下行焊 | |||
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vertical- down welding : 4 phrases in 2 subjects |
| Rail transport | 2 |
| Technology | 2 |
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