單項選擇題

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

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單項選擇題

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

單項選擇題

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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