11. 如右圖所示,兩個MOSFET之寬長W/L比為(W/L)1 = 4(W/L)2, 設MOSFET導通的臨界電壓Vt1 = Vt2 = 2 V,則V0值為何?(A) 2 V(B) 4 V(C) 6 V(D) 8 V