27. 求圖(二十)電路 ab 兩端之諾頓等效電流 IN及諾頓等效電阻 RN為何值？ 
(A) IN = 0.5 A、RN = 4 Ω
(B) IN = 0.5 A、RN = 8 Ω
(C) IN = 1.5 A、RN = 4 Ω
(D) IN = 1.5 A、RN = 8 Ω

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統計： A(3), B(1), C(14), D(2), E(0) #716686