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阶段高度在地下开采中，上下相邻两个阶段水平的垂直距离。阶段高度对开拓方法和采矿工艺的合理性及采矿成本有直接的影响
expl. interval of level
阶段高度
tech. lift
阶段 高度: 5 phrases in 3 subjects
Athletics1
Economy1
Technology3

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