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| acetylene welding | |||
| oxy-acetylene welding; autogenous welding | |||
| oxyacetylene welding | |||
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| oxyacetylene welding | |||
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氧 块 焊 : 7 phrases in 4 subjects |
| Automobiles | 2 |
| Chemistry | 2 |
| Nautical | 1 |
| Technology | 2 |
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