pillar extraction
短语词组
- Three pillar extraction panels 三大支柱提取板;三個支柱提取麪板;三個柱子提取磐區;三個支柱開採板
- 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