世間萬物，什麼(me)東西都(dōu)有它的作用，有的是與生俱來的，有的是我們人類後(hòu)天根據需要發(fā)明創造的，很多的東西我們都(dōu)沒(méi)有見過(guò)，也沒(méi)有聽說過(guò)比如化糞池模具。

With the increase of cement engineering projects in foreign countries and general contracting projects, more and more cement pipes are exported.

With the rapid development of China's capital construction and technological progress, a large number of construction of the drainage pipeline project, for the roller to provide a broad market.

The use of variable frequency energy-saving technology is a key method for the transformation of cement pipe making machines. What do we need to pay attention to?