And he opened the bottomless pit; and there arose a smoke out of the pit, as the smoke of a great furnace; and the sun and the air were darkened by reason of the smoke of the pit.
他开了无底坑，便有烟从坑里往上冒，好像大火炉的烟。日头和天空，都因这烟昏暗了。
2
The computer simulation of fluid flow in pitfurnace when large sized gears gas carburized has been done using the theory of hydrokinetics.
利用流体动力学的基本原理用计算机模拟了大尺寸齿轮在井式渗碳炉内进行气体渗碳时的流场分布。
3
This paper mainly introduces the construction and designing essentials of microcontroller control system in cementite process of pit cementite furnace.