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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相关考题
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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 -
单项选择题
Which kind of the following controllers is the most sophisticated controller?（）
A.Proportional controller
B.Integral controller
C.Derivative controller
D.PID controller -
单项选择题
The word “offset” most probably means（）
A.predetermined value
B.measured value
C.off-limit
D.sustained deviation
