【单选题】【消耗次数:1】
非单位负反馈系统,其前向通道传递函数为G(S),反馈通道传递函数为H(S),当输入信号为R(S),则从输入端定义的误差E(S)为()
<imgwidth="126"height="22"src="../uploadfiles/word/zdkzll002.files/image040.png">
<imgwidth="169"height="22"src="../uploadfiles/word/zdkzll002.files/image041.png">
<imgwidth="176"height="22"src="../uploadfiles/word/zdkzll002.files/image042.png">
<imgwidth="168"height="22"src="../uploadfiles/word/zdkzll002.files/image043.png">
参考答案:
复制
纠错
相关题目
【单选题】 在采访中,记者既要&quot;身入&quot;,又要&quot;心入&quot;。&quot;心入&quot;,就是要有强烈的社会责任感, 要对客观事物进行由表及里的分析,还要().
①  A.广泛地接触群众
②  B.多方面地挖掘材料
③  C.细心地掂量各种材料的价值
④  D.细心地掂量各种材料的价值
【多选题】 Whatdoestheword&quot;steal&quot;(thelastpara.)mean?<br/>
【判断题】 新闻用事实说话,即写出事实并把事实说清楚,是&quot;根据事实来描写事实&quot;而不是&quot;根据希望来描写事实&quot;().
①  正确
②  错误
【单选题】 系统在<imgwidth="56"height="24"src="http://wljy.whut.edu.cn//uploadfiles/word/zdkzll002.files/image003.png">作用下的稳态误差<imgwidth="52"height="24"src="http://wljy.whut.edu.cn//uploadfiles/word/zdkzll002.files/image004.png">,说明()
①  型别<imgwidth="38"height="20"src="../uploadfiles/word/zdkzll002.files/image005.png">; 
②  系统不稳定;
③  输入幅值过大;
④  闭环传递函数中有一个积分环节。
【单选题】 已知单位反馈系统的开环传递函数为<imgwidth="159"height="44"src="http://wljy.whut.edu.cn//uploadfiles/word/zdkzll002.files/image048.png">,当输入信号是<imgwidth="104"height="24"src="http://wljy.whut.edu.cn//uploadfiles/word/zdkzll002.files/image049.png">时,系统的稳态误差是()
①  0;
②  ∞;
③  10;
④  20
【单选题】 已知单位反馈系统的开环传递函数为<imgwidth="159"height="44"src="http://wljy.whut.edu.cn//uploadfiles/word/zdkzll002.files/image061.png">,当输入信号是<imgwidth="104"height="24"src="http://wljy.whut.edu.cn//uploadfiles/word/zdkzll002.files/image062.png">时,系统的稳态误差是()
①  0
② 
③  10
④  20
【单选题】 已知负反馈系统的开环传递函数为<imgwidth="134"height="42"src="http://wljy.whut.edu.cn//uploadfiles/word/zdkzll002.files/image050.png">,则该系统的闭环特征方程为()。
①  <imgwidth="108"height="22"src="../uploadfiles/word/zdkzll002.files/image051.png">
②  <imgwidth="179"height="24"src="../uploadfiles/word/zdkzll002.files/image052.png">
③  <imgwidth="128"height="22"src="../uploadfiles/word/zdkzll002.files/image053.png">
④  与是否为单位反馈系统有关
【单选题】 系统特征方程为<imgwidth="184"height="24"src="http://wljy.whut.edu.cn//uploadfiles/word/zdkzll002.files/image001.png">,则系统()
①  稳定;
②  单位阶跃响应曲线为单调指数上升;
③  临界稳定;
④  右半平面闭环极点数<imgwidth="42"height="18"src="../uploadfiles/word/zdkzll002.files/image002.png">。
【单选题】 若某负反馈控制系统的开环传递函数为<imgwidth="52"height="44"src="http://wljy.whut.edu.cn//uploadfiles/word/zdkzll002.files/image036.png">,则该系统的闭环特征方程为()。
①  <imgwidth="74"height="22"src="../uploadfiles/word/zdkzll002.files/image037.png">
②  <imgwidth="95"height="22"src="../uploadfiles/word/zdkzll002.files/image038.png">
③  <imgwidth="92"height="22"src="../uploadfiles/word/zdkzll002.files/image039.png">
④  与是否为单位反馈系统有关
【判断题】 在消息写作上,要力求避免所谓的&quot;三重复&quot;,是指避免标题、导语、主体的重复().
①  正确
②  错误
【单选题】 F.H.奥尔波特(1924)指出,社会心理学是&quot;研究个体的社会行为和()的学科&quot;。
①  A.社会心理
②  B.社会意识
③  C.社会知觉
④  D.社会观念
随机题目
【单选题】 They grabbed her _____ arm and forced her into the car.
①  by her
②  by the
③  in her
④  in the
【单选题】 7. As a teacher, he thinks his business is to stir up__________in his studentsrather than insist on obedience.
①  observation
②  curiosity
③  superiority
④  judgment
【单选题】 8.I saw the________of the rocket yesterday.
①  set
②  go
③  launch
④  jump
【单选题】 In a sudden _____ of anger, the man tore up everything within reach.
①  attack
②  burst
③  split
④  blast
【单选题】 He is quite sure that it’s _____ impossible for him to fulfill the task within two days.
①  roughly
②  exclusively
③  fully
④  absolutely
【单选题】 2. You should deliberate over the question before you_______it.
①  response to
②  respond to
③  retellfrom
④  delete
【单选题】 Anna was reading a piece of science fiction, completely _____ to the outside world.
①  having been lost
②  to be lost
③  losing
④  lost
【单选题】 7. She is poor ______ she can hardly get anything to eat.
①  as much as
②  too much so that
③  so much so that
④  much more than
【单选题】 Of swimming and football he much preferred _____.
①  later
②  the later
③  former
④  the former
【单选题】 8.The sun emerged_________behind the clouds.
①  from
②  around
③  off
④  through