Have you ever experienced you were uncomfortable when you had to check air flow with a smoke tube where ventilation fan or hood was unreachable or was located at confined space?

你经历过你不舒服，你必须检查它配备了烟管流动凡通风风扇罩无法访问或曾在密闭空间在哪里？

The gas producing speed of super lower permeability Anthracite seams is mainly confined by gas flow in the fractures.

指出低渗透无烟煤煤层气产气速率主要受裂隙中气体流动的限制。

In order to explore the effect of ambient pressure on jet flow field in deep well and ultra-deep well, a physical model for flow field of confined water jet at bottom hole was established.

考虑到深井、超深井中井底围压对射流流场有一定的影响，建立了井底受限射流流场的物理模型。