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对焊头 : 79 phrases in 15 subjects |
| Architecture | 3 |
| Automobiles | 2 |
| Aviation | 1 |
| Bridge construction | 6 |
| Business | 1 |
| Chemistry | 1 |
| Compressors | 1 |
| Drilling | 1 |
| General | 3 |
| Metallurgy | 12 |
| Oil / petroleum | 7 |
| Plastics | 7 |
| Space | 2 |
| Steel production | 1 |
| Technology | 31 |
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