shaft sinking
短语词组
- simultaneous shaft -sinking 一次成井
- shaft -sinking by freezing m-ethod 竖井冻结法掘进
- special shaft -sinking method 特殊凿井法
- combination shaft -sinking machine 立井联合掘进机
- water supply and shaft -sinking 供水凿井
- Shaft sinking -tool 井探
- drop -shaft sinking 沉井法
- Single -drum shaft sinking winder 单筒缠绕式凿井绞车 返回 shaft sinking