T=1,72=2,73=3,k=2 15 品 -0.5 0.5 Real Axis5 -1 -0.5 0 0.5 1 1.5 2 -1.5 -1 -0.5 0 0.5 1 1.5 Real Axis Imag Axis T1 =1,T2 = 2,T3 = 3,K = 2 