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选煤选煤 : 86 phrases in 13 subjects |
| Chemistry | 3 |
| Coal | 1 |
| Electronics | 1 |
| Energy industry | 1 |
| Environment | 2 |
| General | 39 |
| Geology | 6 |
| Metallurgy | 2 |
| Mineral processing | 1 |
| Mining | 2 |
| Oil / petroleum | 3 |
| Oil processing plants | 4 |
| Technology | 21 |
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