Consider a sound wave propagating through a stagnant gas with velocity a, as sketched in Fig. 8.4a.
假设声波在气体中以速度a在静止气体中传播，如图8.4 a所示。
If the gas mixture in the tube is stagnant, the transfer occurs by molecular diffusion.
如果管中的混合气体是不流动的，那么传递就通过分子扩散来进行。
In the excavation area with weak or stagnant hydrodynamics, the gas outburst usually happed with large a...
在水动力比较弱的采煤区，瓦斯突出事故就比较多，或者瓦斯涌出量比较大。
应用推荐