單項(xiàng)選擇題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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1.單項(xiàng)選擇題In an automation system, the effect of a control action sensed by a controller is known as （）

A.command input
B.set point signal
C.output
D.feedback

3.單項(xiàng)選擇題The quantity or condition which is measured and controlled is known as the （）

A.controlled variable
B.manipulated variable
C.set point
D.control point

5.單項(xiàng)選擇題The ratio of output response to a specified change in the input is known as（）

A.primary feedback
B.deviation
C.sensitivity
D.dead band