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双炉 : 80 phrases in 9 subjects |
| Chemistry | 1 |
| Electronics | 4 |
| General | 32 |
| Metallurgy | 4 |
| Nautical | 2 |
| Oil / petroleum | 1 |
| Oil processing plants | 19 |
| Shipbuilding | 2 |
| Technology | 15 |
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