26 如圖所示電路，R1 = 1 kΩ，R2 = R3 = 3 kΩ，C1 = 2μF，C2 = 1 μF，C3 = 2μF，試問當電路達穩定狀態後，電容器 C3的端電壓為多少伏特? (A) 6(B) 9(C) 12(D) 15
