mining limit line 采掘范围线
upper mining limit 回采上限
stepwise mining limit 分期开采境界
improving mining limit 提高开采上限
mining limit optimization 开采境界优化
mining upper limit 开采上限
lifting upper limit of mining 提高开采上限
upper limit of mining 开采上限
limit of seam mining 煤层综放开采上限
·2,447,543篇论文数据，部分数据来源于NoteExpress
Based on the "surface mine long term planing model" the stepwise mining limit optimization model has been set up for inclined ore bed.
在倾斜矿床露天矿长远规划模型的基础上，建立了分期开采境界优化模型。
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