34 圖示理想運算放大器電路，若輸出電壓vO＝2(v1－v2)，則：
(A)R1＝2kΩ、R2＝4kΩ、R3＝10kΩ、R4＝10kΩ
(B)R1＝1kΩ、R2＝2kΩ、R3＝5kΩ、R4＝10kΩ
(C)R1＝1kΩ、R2＝2kΩ、R3＝3kΩ、R4＝4kΩ
(D)R1＝2kΩ、R2＝3kΩ、R3＝3kΩ、R4＝8kΩ