19.兩個電阻R1與R2並聯，計算R1支路電流的分流公式是（I為總電流，U為總電壓）：
(A)I1 = R1I/(R1+R2)
(B)I1 = R2I/(R1+R2)
(C)I1 = R1U/(R1+R2)
(D)I1 = R2U/(R1+R2)

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統計： A(12), B(100), C(22), D(15), E(0) #1201570