ventilation shaft

Mine, the causes of natural thermal potential difference in return air in main shaft and its influence on mine ventilation system and the control methods.

阐述了造成主井回风的自然热位差产生原因和对通风系统的影响，以及治理办法。

And one of the effective ventilation ways is that the shaft is ventilated by stage.

而有效的通风方式之一就是竖井分段通风。

a ventilation shaft

通风井

[不可数名词]a ventilation shaft

通风井

This text introduces the application of theodolite in the directional measure technique in Qidong ventilation shaft.

简要介绍了陀螺经纬仪在定向测量中的应用和祁东风井联系测量技术.

Shaft to ventilation and excavation, repair qanat soil when used.

竖井是为了通风和挖掘 、 修理坎儿井时提土之用的.

Ride the train to the ventilation shaft.

乘火车到达通风井找到柱状物体.