题目内容：
"当系统的输入和输出已知时，求系统结构与参数的问题，称"
参考答案：
选择题："当系统的输入和输出已知时，求系统结构与参数的问题，称"
- 题目分类：西安交通大学---机械控制工程基础
- 题目类型：选择题
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，称"
，称"
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试论公元前2000年代前期，印欧语人的南徙对古代西亚文明的演进的影响？
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带传动中,在相同的预紧力条件下,V带比平带能传递较大的功率,是因为V带()A.强度高B、尺寸小C、摩擦力大D、没有接头
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As little children, most of us were taught the virtue (美德) of honesty from fairy
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确定楼梯段宽度应以什么为依据？楼梯坡度如何确定？踏步高与踏步宽和行人步距的关系如何？