【单选题】【消耗次数：1】
若某负反馈控制系统的开环传递函数为，则该系统的闭环特征方程为（）。
①
②
③
④
与是否为单位反馈系统有关
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相关题目
【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
【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】
已知下列负反馈系统的开环传递函数，应画零度根轨迹的是（）。
①
<imgwidth="67"height="47"src="../uploadfiles/word/zdkzll002.files/image044.png">
②
<imgwidth="93"height="47"src="../uploadfiles/word/zdkzll002.files/image045.png">
③
<imgwidth="86"height="47"src="../uploadfiles/word/zdkzll002.files/image046.png">
④
<imgwidth="65"height="47"src="../uploadfiles/word/zdkzll002.files/image047.png">
【单选题】
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()
①
<imgwidth="126"height="22"src="../uploadfiles/word/zdkzll002.files/image040.png">
②
<imgwidth="169"height="22"src="../uploadfiles/word/zdkzll002.files/image041.png">
③
<imgwidth="176"height="22"src="../uploadfiles/word/zdkzll002.files/image042.png">
④
<imgwidth="168"height="22"src="../uploadfiles/word/zdkzll002.files/image043.png">
随机题目
【判断题】
答题说明：句子没有语法错误请选择“正确”，有语法错误请选择“错误”Only by working hard we can succeed in this difficult experiment.
①
正确
②
错误
【判断题】
答题说明：句子没有语法错误请选择“正确”，有语法错误请选择“错误”Hardly he had entered the room when he was asked to leave the room at once.
①
正确
②
错误
【多选题】
He_____________ to be reading when his mother came in.
①
drew a conclusion
②
nothing but
③
made himself seem
④
pretended
【多选题】
Computer can store_____________ amounts of information.
①
huge
②
vast
③
large
④
small
【多选题】
He arrived too late and_____________ the train.
①
failed to catch
②
fail to catch
③
missed
④
miss
【多选题】
_____________ , you are perfect in mind and body.
①
In time
②
In a word
③
In short
④
In sum
【多选题】
_____________ the bad weather, they did experiments on ways of storing solar energy.
①
Though
②
Although
③
Despite
④
In spite of
【多选题】
You speak ____________ you had really been there.
①
as soon as
②
as many as
③
as if
④
as though