单项选择题
A.operational B.open C.closed securely D.at middle position
The monitoring function may serve all of the following ...
单项选择题The monitoring function may serve all of the following purposes except（）
A.instigating corrective action B.indicating values of controlled variables C.warning of off-limit conditions D.providing record of performance
A feedback is an input（）A.which governs the state of a ...
单项选择题A feedback is an input（）
A.which governs the state of a variable B.which provides a visual and audible alarm C.which indicates values of controlled variables D.which measures the state of the controlled variable
The closed-loop system differs from the open-loop syste...
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
