This paper analyzes the failures of air operated double position butterfly valve used in car type furnace, and puts forward improving plan.
本文对台车炉气动双位蝶阀产生的故障进行了分析，并提出了改进方案。
2
This furnace dwelling was designed to do double duty as a living classroom.
这座大锅炉房还有另一重任务，就是作为生物课堂。
3
Three kinds of high temperature resistance furnaces with different heating method are designed, that is, outside-wall heating, inside-wall heating and double heating high temperature furnace.