30 a人20CB23.521825 20dB/dec cf2dB=9.5424251 40db/dec 10 30 cf3dB=304575749 图5-22某一0型系统对数幅值曲线 15 6 (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