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| 锅炉煤; 低挥发分烟煤; 机车用煤; 蒸发煤; 锅炉用煤 | |||
| паровичный уголь: 11 phrases in 4 subjects |
| Chemistry | 4 |
| General | 4 |
| Geology | 1 |
| Technology | 2 |
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