tunneling law的意思|示意

This paper mainly focused on the gas emission law of coal wall for the double tunneling working faces.

简要论述了煤巷综掘工作面瓦斯涌出的特征及规律，提出了综掘工作面瓦斯涌出的控制与解决措施。

According to the law of similarity of fan, the characteristic of long-distance tunneling ventilation was analyzed, and the energy consumption of variable frequency fan was described.

根据风杌的相似定律，阐述了特长隧道掘进通风的特性，详细分析了风机变频工作的能耗。