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手 工焊弧 : 21 phrases in 8 subjects |
| Automobiles | 1 |
| Bridge construction | 1 |
| Drilling | 1 |
| Hydroelectric power stations | 1 |
| Metallurgy | 6 |
| Oil / petroleum | 1 |
| Technology | 8 |
| Welding | 2 |
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