21 關於圖(a)與(b)電路之敘述,若二極體為理想,Vp1 與 Vp2 為 Vo1 與 Vo2 之峰值電壓,下列何者正 確? (A)Vp1 = 5 V,Vp2 = -5 V(B)Vp1 = 5 V,Vp2 = 5 V(C)Vp1 = -5 V,Vp2 = 5 V(D)Vp1 = -5 V,Vp2 = -5 V