43. 關於右圖電路,RS = R1 = R2 = RB、 RA = 2RB、 二極體導通電壓為0.7 V,假設A為理想運 算放大器,下列何者有誤?(A) VS = 1 V、VO = 2 V(B)二極體導通條件為VS≥ 2.8 V(C)VS = 4 V、VO = 6.73 V(D)VS = 3 V、 VO = 5.4 V