System state variables are a minimal set of system state control variable is determined, and when the selection control system state variables, we usually have a wide selection
The system's state variables are the smallest set of changes that determine the state of the control system, and we usually have several choices when selecting the state variables of the control system
The state variables of the system are the least group of changes to determine the state of the control system. When selecting the state variables of the control system, we usually have many choices<br>