A.1/10 B.1/1024 C.1/1023 D.1/2
A.8 B.16 C.32 D.64
A.VT+=1/3VCC,VT-=2/3VCC B.VT+=2/3VCC,VT-=1/3VCC C.VT+=VCC,VT-=1/3VCC D.VT+=VCC,VT-=2/3VCC