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| acetylene welding; autogenous welding; gas welding | |||
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| acetylene welding | |||
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乙块焊 : 18 phrases in 6 subjects |
| Automobiles | 5 |
| Chemistry | 1 |
| Electric machinery | 2 |
| Nautical | 1 |
| Shipbuilding | 4 |
| Technology | 5 |
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