单选题Which of the following definitions can be used to define the term ‘offset ’ as a characteristic of controller action?（）AThe period of time in which the set point and the control point coincideBThe periodic change between the set point and the control pointCThe variable difference between the set point and the control pointDThe constant difference between the set point and the control point
单选题
Which of the following definitions can be used to define the term ‘offset ’ as a characteristic of controller action?（）
A
The period of time in which the set point and the control point coincide
B
The periodic change between the set point and the control point
C
The variable difference between the set point and the control point
D
The constant difference between the set point and the control point
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