26.如右圖之電路,在下列哪種條件下,其電壓增益值V ⁄V 與C1C2 頻率無關? (OP:理想運算放大器) (A) R1C2 = R2C1 (B) R1R2 = C1C2(C) C1 = C2(D) R1C1 = R2C2