138. 如下圖所示電路,a、 b 兩端之戴維寧等效電壓 VTh 及 等效電阻 RTh 為何? 統測 113

(A) VTh = 12V、RTh = 6Ω
(B) VTh = 18V、RTh = 6Ω
(C) VTh = 18V、RTh = 3Ω
(D) VTh = 12V、RTh = 3Ω

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