如圖（三）所示之電路，由a、b兩端往左看入之諾頓等效電流約為多少安培？ (A) 0.8 (B) 2(C) 4(D) 2

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5. 如圖（三）所示之電路，由a、b兩端往左看入之諾頓等效電流約為多少安培？
(A) 0.8
(B) 1.2
(C) 2.4
(D) 3.2

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