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| среднеобогатимый уголь | |||
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medium coal : 23 phrases in 8 subjects |
| Energy industry | 5 |
| Gas processing plants | 4 |
| Geology | 1 |
| Makarov | 4 |
| Metallurgy | 3 |
| Mining | 1 |
| Technology | 4 |
| Thermal engineering | 1 |
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