30「20yKB=23.5218252 20 20db/dec cf2dB=9.5424251 40dB/dec 10 20 cf3dB=30.4575749 10 15 图5-22某一0型系统对数幅值曲线 S S+1)(0.2.+1)6 10-1 100 101 -40 -30 -20 -10 0 10 20 30 20logK -20dB/dec -40dB/dec 图5-22 某一0型系统对数幅值曲线 ( 1)(0.2 1) 15 ( ) + + = s s G s cf3_dB=-30.4575749 cf1_dB=23.5218252 cf2_dB=9.5424251