A feedback is an input（）<br>A:which governs the state of a variable<br>B:which provides a visual and audible alarm<br>C:which indicates values of controlled variables<br>D:which measures the state of the controlled variable

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

出自：海船船员证

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