单选题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（）.Areset actionBproportional actionCtwo position actionDrate action
单选题
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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