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[单选题]
频率响应是指控制系统对
A
A．正弦输入的瞬态响应
B
正弦输入的稳态响应C．正切输入的稳态响应 D．正切输入的瞬态响应
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试题答案：
B
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相关题目
随时间推移，系统对干扰信号的响应不断扩大,控制系统- -定是A.稳定的B.不稳定的C.有时稳定D.无法判断
主导极点的特点是（）
闭环频率特性中,系统的频宽(或称带宽)指什么?其对系统响应的快速性和噪声的滤波性能有什么影响?
当典型的二阶系统含有零点时，系统的瞬态响应
系统的稳态误差与_______形式，以及系统的_______，或系统的_______有关。
拉氏变换将时间函数变换成（）
PD调节器是一种（）校正装置。
二阶系统的振荡幅值主要取决于A.系统阻尼B..上升时间C.峰值时间D.调整时间
典型二阶系统在无阻尼情况下的阻尼比ξ等于（）
用系统的相位裕量即可衡量一个系统的相对稳定性。
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1.
世界三大宗教是（ ）
2.
14．有权发布通缉令的司法机关是（ ）
3.
23.下列选项中，输入-处理-输出图（IPO图）需要包括的信息是
4.
下列选项中，符合绝对感受性和绝对感觉阈限在数量上关系的是( )
5.
24. Intricately intertwined with(与……错综交织) self-esteem and inhibition and risk-taking, the construct of anxiety, as it has been studied in the psychological domain(领域), plays an important affective role in second language acquisition. Anxiety is almost impossible to define in a simple sentence. It is associated with feelings of uneasiness, frustration, self-doubt, apprehension(恐惧), or worry. Scovel defined anxiety as “state of apprehension, or vague fear…” We all know what anxiety is and we all have experienced feelings of anxiousness. How does this construct relate to second language learning? Any complex task we undertake can have elements of anxiety in it, aspects in which we doubt our own abilities and wonder if we will indeed succeed. Second language learning is no exception to a long list of complex tasks that are susceptible(易受感染的) to our human anxieties.The research on anxiety suggests that, like self-esteem, anxiety can be experienced at various levels. At the deepest, or global level, trait anxiety is a more permanent predisposition(倾向) to be anxious. Some people are predictably and generally anxious about many things. At a more momentary, or situational level, state anxiety is experienced in relation to some particular event or act. As we learned in the case of self-esteem, then, it is important in a classroom for a teacher to try to determine whether a student’s anxiety stems from a more global trait or whether it comes from a particular situation at the moment.Trait anxiety, because of its global and somewhat ambiguously defined nature, has not proved to be useful in predicting second language achievement. However, recent research on foreign language anxiety, as it has come to be known, focuses more specifically on the situational nature of state anxiety.(10分)24.1 The passage mainly talks about ______.(2分)A. anxietyB. inhibitionC. risk-takingD. self-esteem
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