“open stope mining method”的概念、定义、翻译、参考文献-科学参考

单词	open stope mining method
释义	open stope mining method Encyclopedia 工学空场采矿法释 open stope mining method空场采矿法在回采过程中将矿块划分为矿房和矿柱，分两步骤回采，在回采矿房过程中采场以敞空方式存在，主要靠矿岩本身强度和矿柱支撑能力维护采场稳定性的采矿方法。又称自然支护采矿法。
随便看	second cosmic velocity second countability axiom second countable space second countable topological space second Cousin problem Second creation second critical magnetic field second cultivated machinery second curvature second demographic transition second derivative second derivative test second derivative test discriminant second development second difference second differential second differential parameter second differentiator second distance second dual second dual module second dual space second economics adjustment of China second eigenfunction second electron emission

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