38. 如圖(二十二)所示,a、b兩端的電壓為vab (t),則下列敘述何者正確?
(A) v ab ( 2)=2.5mV
(B) vab ( 6 )=0mV
(C) vab ( 7 )=5mV
(D) v ab ( 9)=2.5mV ˉ
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統計: A(7), B(87), C(12), D(10), E(0) #1986930
統計: A(7), B(87), C(12), D(10), E(0) #1986930