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两步骤回采
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两步骤回采
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回采工艺
释
two step mining
两步骤回采
在回采过程中,将采区或矿块划分为矿房和矿柱,第一步骤回采矿房,第二步骤回采矿柱的回采方式。
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Ivan Stadnyuk
Ivan Susanin
Ivan Sutherland
Ivan Timofeevich Kokorev
Ivan Timofeyevich Kalashnikov
Ivan Vasilyevich Kireyevsky
Ivan Vazov
Ivan Vazov National Theatre
Ivan Venediktovich Elagin
Ivan Vladimirovich Michurin
Ivan Vladislavić
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IVAP
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Ivar Malinovski
IVB
I-V characteristic curve
IV characteristic curve
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IVDD
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