25 如圖所示為一個交流等效電路,其輸入阻抗(Zin=Vi/Ib)為: 
(A)rπ+RE
(B)rπ
(C)rπ((1+β)RE)
(D)rπ+(1+β)RE

(A)rπ+RE
(B)rπ
(C)rπ((1+β)RE)
(D)rπ+(1+β)RE
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統計: A(4), B(4), C(12), D(92), E(0) #852888
統計: A(4), B(4), C(12), D(92), E(0) #852888