In a pneumatic automation system, a unit producing a signal to govern the position of the controller of the measured variable, relative to the value of the measured variable, is said to have（）.<br>A:reset action<br>B:proportional action<br>C:two position action<br>D:rate action

In a pneumatic automation system, a unit producing a signal to govern the position of the controller of the measured variable, relative to the value of the measured variable, is said to have（）.
A:reset action
B:proportional action
C:two position action
D:rate action

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