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| 气体保护焊接 | |||
| 气体保护焊 | |||
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| 气体保护焊 | |||
| gas-shielded welding: 51 phrases in 14 subjects |
| Automobiles | 5 |
| Chemistry | 4 |
| Compressors | 1 |
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| Technology | 13 |