单项选择题

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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单项选择题

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

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