巷道掘进 meaning in Chinese

tunnelling
◇巷道掘进机 tunnelling machine; dintheader

Application of controlled blasting in drivage of coal - rock drift
在半煤岩巷道掘进中的应用
Way of dropping tunnel heading rate
关于降低巷道掘进率的几点做法
Application of bolt and cable supporting in driving roadway
锚杆锚索联合支护在巷道掘进中的应用
Study on improving efficiency of heading advance in kafang mine
提高卡房采选厂巷道掘进效率研究
Excavation and supporting technology in rise roadway with large - angle
大倾角上山巷道掘进支护技术

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