Certain pushbutton lights have two dots,indicating
A.abnormal pushbutton position B.pushbutton being overdriven C.the corresponding part of the pushbutton is not used D.test operation or maintenance information正确答案C
Certain pushbutton lights have two dots,indicating
A.abnormal pushbutton position B.pushbutton being overdriven C.the corresponding part of the pushbutton is not used D.test operation or maintenance information正确答案C