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| 横撑支柱局部留矿的上向梯段采矿法; 局部留矿采矿法 | |||
| 横撑支柱局部留矿的上向梯段采矿法 (局部留矿采矿法) | |||
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система с частичным магазинированием руды : 4 phrases in 2 subjects |
| General | 2 |
| Technology | 2 |
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