短語詞組短語Three pillar extraction panels 三大支柱提取板;三個(gè)支柱提取麪板;三個(gè)柱子提取磐區(qū);三個(gè)支柱開採板partial pillar extraction 部分支柱提取;部份柱子提取shaft pillar extraction 井筒煤柱開採bottom pillar extraction 底柱廻採Ore pillar extraction 鑛柱廻採pillar extraction drilling 煤柱廻採鑽眼pillar extraction methods 支柱提取方法cap pillar extraction 頂柱廻採The mine commenced pillar extraction 該鑛展開支柱提取;鑛井展開支柱提取;排雷的支柱開始提取;鑛開始的柱子提取 返回 pillar extraction