单项选择题

From the passage, we can learn that the simplest controller action is（）

A.two-step controller action
B.proportional, controller action
C.integral controller action
D.derivative controller action

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单项选择题

A.Proportional controller
B.Integral controller
C.Derivative controller
D.PID controller

单项选择题

A.predetermined value
B.measured value
C.off-limit
D.sustained deviation

单项选择题

A.proportional control
B.integral control
C.derivative control
D.on-off control