inverted steps working

基本解释倒梯段开采

网络释义

1)inverted steps working,倒梯段开采2)sublevel benching,分段梯段式开采3)overhand stope method,上向梯段开采法4)sublevel bench stoping,分段阶梯式开采5)exraction,stoping,withdrawal,回采,梯段形开采法6)bank work,阶梯开采