28. 如下圖所示電路,等效電阻 R1 ,R2,R3分別為
(A)R1=36Ω,R2=12Ω, R3=24Ω
(B)R1=24Ω,R2=12Ω,R3=36Ω
(C)R1=12Ω,R2=24Ω, R3=36Ω
(D)R1=12Ω,R2=36Ω,R3=24Ω
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統計: A(438), B(32), C(27), D(17), E(0) #1983250
統計: A(438), B(32), C(27), D(17), E(0) #1983250