25. 如【圖8】所示電路中,a、b兩端的戴維寧等效電壓ETh、等效電阻RTh分別為何?
(A)6V,1Ω
(B)4V,2Ω
(C)3V,2Ω
(D)3V,5Ω 
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統計: A(24), B(26), C(458), D(10), E(0) #2054690
統計: A(24), B(26), C(458), D(10), E(0) #2054690