downcast air是什么意思

网络释义

用法例句

In this paper , the basic law of temperature change in an intake shaft is deduced, that changes with the air temperature at the inlet, the air flow, the shaft depth etc.

通过对矿山通风系统进风井井筒中气温预测模型和预测数值的分析 ,得出了在一定的围岩热物理条件下 ,进风井井筒气温随井口气温、风量、井深等因素变化的基本规

In the light of some problems existing in the construction of coal mine\'s ventilation subvertical such as the more installations,complicated techniques,and difficult promotion of the producing speed,etc.

针对煤矿进风立井施工中设备较多、工艺复杂、提高进度困难等问题,总结和介绍了长平矿釜山进风立井施工过程中所采取的一些技术和工艺,探讨了有效提高施工进度的方法。