平口圆锥管的展开我要做一个平口圆锥管,上口直径900毫米.下口直径650毫米,高是1100毫米,请问圆规画园的半径是多少

塞子紧时,与瓶口的摩擦力也大,瓶内气体的压强增大,当瓶内气体大到一定程度时,对外产生的压力也大,这样,就很难被压缩了.
压缩气体时,能量是如果变化的?
答：机械能转化为气体的内能.

在“瓶塞跳出,出现白雾”这个过程中,发生的物态变化是液化.这个现象说明了瓶塞跳出对外做功,内能减少,温度降低,水蒸气遇冷液化成小水滴.

1.Products in the process of even mouth,Because the product not flat,Cause ports appear uneven phenomenon.
2.Products in the assembly process,Due to the port expansion mouth appeared after material trace overpull,Leads to the ports of the rugged products,The resulting product verticality is poor,Extended segment is very poor,Length is very poor.
Corrective measures
1.Change product processing technology.Lengthen steel pipe materials in length,Even mouth length,For after the production with secondary flat sequence mouth machining allowance.
2.After completion of the product assembly,Adding secondary even mouth process.Used to guarantee the end product of port perpendicularity,lengthAnd port extension section size.