该程序在C++环境实现液位的PID控制，也可以无扰动的切换到手动模式-PID control of the program to achieve the level of C++ environment, can also switch to manual mode disturbances

用vb编制的对水箱控制的pid程序，适合对pid有一定了解的人-With vb prepared for tank pid control procedures, suitable for people who have a certain understanding pid