题目内容
（请给出正确答案）
已知单位反馈系统I, II, II均为最小相位系统，其开环对数幅频特性的渐近线分别在图5-7中给出，
试完成:
(1)求出各系统分别对单位阶跃输入和单位斜坡输入时的稳态误差；
(2)分析比较系统II和系统对于阶跃输入的超调量。
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