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單項(xiàng)選擇題

The closed-loop system differs from the open-loop system by（）

A.the lack of a feedback
B.the presence of a feed back
C.the lack of a computer
D.the presence of a computer

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

Which kind of the following controllers is the most sophisticated controller?（）

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

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