shaft sinking
短语词组
- simultaneous shaft -sinking 一次成井
- shaft -sinking by freezing m-ethod 竪井凍結法掘進
- special shaft -sinking method 特殊鑿井法
- combination shaft -sinking machine 立井聯郃掘進機
- water supply and shaft -sinking 供水鑿井
- Shaft sinking -tool 井探
- drop -shaft sinking 沉井法
- Single -drum shaft sinking winder 單筒纏繞式鑿井絞車 返回 shaft sinking