10.如【圖 10】所示電路中,若 Vi =10sin t(伏特),二極體為理想的,則下列敘述何者正確?(A)當ωt = π / 2 時;Vo =15V (B)當ω t = -π / 2 時;Vo = -5V(C)當ω t = π / 6 時;Vo = 0V (D)當ω t = π - π / 6 時;Vo = 0V