ultimately controlled variable是什么意思

用法例句

In this paper, based on theory of process control and chemical engineering, the possibility of pressure difference acted as basic controlled variable for rectification tower is demonstrated.

以过程控制及化工原理为基础，论证了采用压差作为精馏塔基本被控交量的可行性，指出了在哪几种工况下的精馏可采用压差来控制热媒流量并有其独特优点，拓展了压差这一基本被控变量在精馏中的应用及地位。