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直流电焊 : 17 phrases in 10 subjects |
| Architecture | 1 |
| Chemistry | 1 |
| Drilling | 1 |
| Electric machinery | 1 |
| Electronics | 1 |
| Metallurgy | 3 |
| Oil / petroleum | 1 |
| Shipbuilding | 2 |
| Space | 1 |
| Technology | 5 |
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