A.gh0(t)=us(t)-us(t-T)B.gh0(t)=us(t-T)C.gh0(t)=us(t-T)-us(t)D.gh0(t)=us(t)+us(t-T)
A.F(z)=z/(z2-1)B.F(z)=z2/(z-1)C.F(z)=z/(z-1)D.F(z)=z/(z2-2)
A.G(z)=C(z)/(R(z)=(1+0.5z-1-z-2+0.5z-3)/(4-z-2-0.6z-3))B.G(z)=C(z)/(R(z)=(z-2-0.6z-3)/(1+0.5z-1-z-2+0.5z-3))C.G(z)=C(z)/(R(z)=(4-z-2-0.6z-3)/(0.5z-1-z-2+0.5z-3))D.G(z)=C(z)/(R(z)=(4-z-2-0.6z-3)/(1+0.5z-1-z-2+0.5z-3))