問題詳情
29.用555IC組成史密特觸發電路時，若供給IC的電源為+Vcc，則其正觸發臨界電壓為何？ 
參考答案
答案：A
難度：適中0.555556
統計：A(5),B(0),C(3),D(0),E(0)
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