2.如圖2所示之電路,從AB兩端看圖2(b)為圖2(a)之等效電路。求等效電阻R!及等效電壓源 Ei之值: 
(A) R1 = 0. 75 Ω,E1 = 0. 75 V
(B) R1 = 0. 8 Ω,E1 = 0. 8 V
(C) R1 = 0. 67 Ω,E1 = l V
(D) R1 = 1.5 Ω,E1 = l V
(E) R1 = 2 Ω,E1 = 0.75 V。
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統計: A(23), B(258), C(14), D(30), E(6) #691791
統計: A(23), B(258), C(14), D(30), E(6) #691791