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保护金属电弧焊 : 30 phrases in 9 subjects |
| Automobiles | 1 |
| Aviation | 4 |
| Chemistry | 1 |
| Electronics | 2 |
| Metallurgy | 8 |
| Nautical | 4 |
| Oil / petroleum | 2 |
| Space | 2 |
| Technology | 6 |
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