回柱铺定柱2) prop taking 回柱3) slewing ring with fixed column 定柱式回转支承4) prop supporting and drawing 回柱与支柱5) Pillar extraction 矿柱回采 例句>> 6) Pillar recovery 矿柱回采 1. Stope pillar recovery in overall mining method; 全面采矿法采场的矿柱回采 更多例句>> ...