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| 煤的精化 去除煤中的杂质的过程。 (Переработка угля в целях удаления примесей); 洗煤; 煤的洗选; 选煤选煤 | |||
| 选煤 | |||
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обогащение угля : 11 phrases in 3 subjects |
| Energy industry | 1 |
| General | 7 |
| Technology | 3 |
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