西南《1073信号与系统》22春作业答案题目-西南大学-无忧答案网

黄老师 发表于 2022-3-29 09:16:36

西南《1073信号与系统》22春作业答案题目

1073 信号与系统
1.[单选题] 
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 设<img width="36" height="21" src="data:image/png;base64,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" v:shapes="_x0000_i1025"/>是信号<img width="32" height="21" src="data:image/png;base64,R0lGODlhIAAVAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAIAAwAbAA4AhAAAAAAAAB0AHQAAHQAAMx0AMgAcSAAzWh1GbDMAADIAHTIAMjNGbjNbgEgcAEceM1ozAF1/f0huf1l/bmxGHX9/XX9uSGaIiIBbM4iIZgECAwECAwECAwECAwECAwECAwVnICCOYhKQ4oKqKKoAGEq0gECLEM3SBY3NqBzJIpCMDihHIAAcvUaQ5UnUC9KaOFSitUVRsIDnKIFAVWUog9arRv1IDm6r3BLfziIbDUIHBAYkFEgjFDcjRoYAhQB4NHpaDSNMiZQjIQA7" v:shapes="_x0000_i1026"/>的傅里叶变换，<img width="32" height="21" src="data:image/png;base64,R0lGODlhIAAVAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAIAAwAbAA4AhAAAAAAAAB0AHQAAHQAAMx0AMgAcSAAzWh1GbDMAADIAHTIAMjNGbjNbgEgcAEceM1ozAF1/f0huf1l/bmxGHX9/XX9uSGaIiIBbM4iIZgECAwECAwECAwECAwECAwECAwVnICCOYhKQ4oKqKKoAGEq0gECLEM3SBY3NqBzJIpCMDihHIAAcvUaQ5UnUC9KaOFSitUVRsIDnKIFAVWUog9arRv1IDm6r3BLfziIbDUIHBAYkFEgjFDcjRoYAhQB4NHpaDSNMiZQjIQA7" v:shapes="_x0000_i1027"/>的波形如图所示，则<img width="89" height="35" src="data:image/png;base64,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" v:shapes="_x0000_i1028"/>等于（ ）。
<img width="187" height="115" align="left" src="data:image/png;base64,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" hspace="12" v:shapes="_x0000_s1026"/>

<p style="color: rgb(0, 0, 0); font-family: "Times New Roman",serif; font-style: normal; font-weight: normal; margin-top: 0cm; margin-bottom: 0pt; mso-list: l0 level1 lfo1; tab-stops: list 57.0pt left 116.4pt;">

 






 
 

A.4pi
B.2pi
C.6pi
D.0
2.[单选题] 完整表示对理想滤波器的逼近，可以采用（）
A.误差容限图
B.阻带最小衰减
C.对模拟与数字滤波器要区别对待
D.通带内最大误差
3.[单选题] 已知信号x(t)的傅里叶变换为<img width="120" height="20" src="data:image/png;base64,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" v:shapes="_x0000_i1025"/>，则信号y(t)的频谱为（　　　）。
 <img width="215" height="108" src="data:image/png;base64,R0lGODlh1wBsAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAoACgDBAFkAhgAAAAAAAAcHBxQUFAQEBBAQEAAAHRwcHAwMDB4eHhISEhoaGhcXFxkZGRERERYWFg0NDQ8PDxMTEx0AMh0dSAAcSAAzWh1GbDIAHTMAADIAMjMeRzQ0HTQ0NCQkJDAwMCAgICwsLDw8PC4uLjo6OigoKDs7Ozc3NzIyMjg4OCcnJzExMT8/PzNGbjNbgEgcAEgdHVozAFszM0YzRl9GHVVVVUREREBAQFFRUV1dXVtISEJCQkpKSllZWUxMTEZGRldXV1tbW0ZGbl1/f0huf2xGHW5bNW5dXX9/XX9uSG5uRHd3d3Nzc2ZmZmBgYG5ubmpqamaIiIBbM4iIZoiIiAECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwf/gACCg4SFhoeIiYqLjI2Oj5CRkpORNZSXmJmaiB2bnpkDn6KjpIMCpaiKAQGpra6OBKyvrjers7e4ADi2lFKFMbmEBasEjhOHGMHKiCCrspFFhy/LzgE4jUSFx0nHy96C1TeNBgBJAEqDRQHkgjDBIdUHhrIvFQAWhC+8wN/LItUIMMkodCFXrGqHjmWLRsgcoYL9giGo9kwRMHMMD2XMNcLiQ4LpInoj4QESRAAnTwpSiUscp0G+CCUj5ELksg+PpASo6RBAjJ2D3ClzOa9gBnYzwbED0M1mrmuX7P36RpRRU5lObzbSV5NQzEH8llVtpKFQ2azKcKK9NHat20Jq/99Caiv3LdS6c/Hqjat3Ed2+WfkCTvR3cETBhgsVTuztbt8mfhmjRey2RIAElxEtlpy277OKijk7pSyXB+hBm0XfcuzZBGHVIkm7VaCIBOzYfXvQBgAZUcDb32RnlbVL8wIfwJexllsCQPPmiFIUSK4VuLgf1DsnF8cgey7hhomq8D5ruWqiOci/Aj+4qjz1rdi3H3QCfvzthbrbJ2Ve9Nj6+40iX19tvRfgJwMSWEh6ByKInyHjNahJf5zRpZ+EmCSIV2HYYXiJhhsiMp2HlIDXA2CFIUeiJBSCE14iF674iGwmBACdXpsZKGMjwtk4nyJA7OiIbE34qOAiIwqpSP+LAJxW12YiKMkIkUbi2EiSUh7SowI8oNhICFkiIluXXR7JSIxhCnJDA9SllqYhOTjwwIM8vgmADyV9gENJt7kpCJZKAggATgyeF0mUUoIpiGM6SuanIKEoCQJcC1YoSYQyojloIR6oyNijgkwqY6OCUCboj5FoeqCohVCo6IuSeNrgq4bIxqqZkUR6YAeIiqmIqnKBOkiHB8qq5SKkviUsIcBSB0KhiDAZqpeUYKpeb4vIR6uymFib3a3ZOiICiMEsOwi21ElLqSPqemMuIafeNi4k7RICblbvDqIrbNsOGQm6+G4Sr2R8SkIuAPeKlO8gDACcWLL+UmJsPwsPAi32Y80yUu8hHQxM1SbeDgbxjJn0K9Yn+wIWssGaJDzUJ8T25THLmmQ8S8WFAPrIKgOccDFeGyN7yTA6R4KTEwAgrXTSTC/tdNMA2Pb01FA7QVExQVP9dJA7VO211lCXBPbYUHdH9tQTITQxIyC07fbbcMctNwgQJDD33c1QxDMkeL8dwQJ9B/52AxIIbngCdRv+9kEUFa0XRQXbqcgwzozsWQGdSO5IAQgcrPnnmTjpVgI3iiS6aKuUWdcqpX9j2emoA1al6aoDZ1rtcs0eEeyc8R6M3oPo/s3t2RGPV5Gt9+M7Y8ubnrw3OwSAO2wIre6MSK/zMkogADs=" v:shapes="_x0000_i1026"/>
A.R(w)cos(w)
B.R(w)/2
C.R(w/2)
D.R(w)
4.[单选题] 关于抽样，下列说法错误的是（）
A.E.理想的冲激采样可表示零阶保持抽样，二者的频谱变化是一致的。
B.时域抽样，频域会产生周期延拓
C.频域抽样，时域会产生周期延拓
D.由时域抽样可知，序列的频谱是周期连续的频谱
5.[单选题] 已知<img width="77" height="21" src="data:image/png;base64,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" v:shapes="_x0000_i1025"/>，则<img width="31" height="20" src="data:image/png;base64,R0lGODlhHwAUAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAIABAAaAAwAhAAAAAAAAB0AAAAAHR0AMgAAMx0dSAAzWh1GbDIAHTIAMjMeRzNGbjNbgEgcAEgdHUceM1ozAFtISF1/f0huf2xGHX9ZSH9/XX9uSGaIiIBbM4iIZgECAwECAwECAwECAwVcICACQVkeI6CIwjAuadqMyJiICQUQIx/DMUBkhAI4ZqKiSDNCAjCjymgYHJVcKWVNtBWmgDGpSOxNdatcougYTemC5JQhNhMECuj5qBV7oINOQUx/MTdoPoSJMSEAOw==" v:shapes="_x0000_i1026"/>等于（）
A.2pi
B.0
C.1/2
D.1
6.[单选题] 共轭对称的信号，其幅值与相位分别为（）
A.C.偶、偶函数
B.奇、偶函数
C.偶、奇函数
D.奇、奇函数
7.[单选题] <img width="146" height="32" src="data:image/png;base64,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" v:shapes="_x0000_i1025"/>（）
A.B.-1
B.0
C.2
D.1
8.[单选题] <img width="84" height="21" src="data:image/png;base64,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" v:shapes="_x0000_i1025"/>(　）
A.f'(t)
B.１
C.f(0)
D.f(t)
9.[单选题] 周期信号<img width="32" height="21" src="data:image/png;base64,R0lGODlhIAAVAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAIAAwAbAA4AhAAAAAAAAB0AHQAAHQAAMx0AMgAcSAAzWh1GbDMAADIAHTIAMjNGbjNbgEgcAEceM1ozAF1/f0huf1l/bmxGHX9/XX9uSGaIiIBbM4iIZgECAwECAwECAwECAwECAwECAwVnICCOYhKQ4oKqKKoAGEq0gECLEM3SBY3NqBzJIpCMDihHIAAcvUaQ5UnUC9KaOFSitUVRsIDnKIFAVWUog9arRv1IDm6r3BLfziIbDUIHBAYkFEgjFDcjRoYAhQB4NHpaDSNMiZQjIQA7" v:shapes="_x0000_i1025"/>的波形如图所示，则其傅里叶级数中含有（ ）。
 <img width="165" height="93" src="data:image/png;base64,R0lGODlhpQBdAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAYABQCWAFMAhQAAAAAAABwcHAQEBBAQEB4eHgcHBxEREQICAgwMDBcXFwEBAQYGBhkZGRYWFgUFBQ0NDQoKCgsLCxISEjQ0NCQkJDAwMCAgIDw8PDs7OygoKCwsLDc3NycnJzExMURERFFRUUJCQllZWUpKSl9fX1dXV0xMTEBAQEZGRltbW1VVVV1dXW5ubnd3d3Nzc2pqamZmZmBgYGJiYoiIiAECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwb/QIBwSCwaj8ikcslsOp/QqHTqDFCv2Kx22wx4ueCweGy8CAaXC3nNbkcJUph7TsfCkZlAoQiq+/9Od0YiRxlLcoCJc4JcGoqPa4xDXl9EMUMalCOQnGySWo6dolmfQptGp0OpQoijrlOlr7J+sZRLBQF9s7tQsby/Y77Aw1vCxMdUxsjLT8rMz0rO0NNF0tTX1tfT2drP3N3L3+DH4uPD5ea/6OlYFGQGZCbsSRcDYwcIYwlk+68CAOuOVACQDwwFDgAshLmgQtY/gGEUyijIRZ4uMHIUjuowJOCQDR+GUMyiZohGLQ8TXoSEsCOXhkImaoEhoNXKKzdPPqpw06MC/yMjqaQ0mYWDzlGXqmFZcUTmlZBGbkrhaOTon59H0JkYeCQoFKtEhSKxIHVOWZdTWjb16oTrkbNNhhYB6wYDXSHiqCZhy0Ru1SklXW1g8s1vEadQsCaBq8Tt2D+Bo0UxDDRK5CR3kbhbQraO4iXZKB/mi2QwE8ZHUDTJ/MiaXiakjUBd7eQyF9uRnKhlgngJzCaoWUVhLUQeLSYVjD+JLeSzE+Kix6LeTUcZUyi9jSSNglq1FNav6wiLroQ0CMdfk2wWQz73kd9Ssg+hDgUu7udJ2rsv8sE0FbbhfXeEfpiVdV91f2EhH4GLHeGcgEagB4gkEk4RFINKHHXgFRys1/saERgm0duGT9zkHxZHeceJIA9eQVGFVGhkAQZcdAZAiJ4IQSJ2BXmYxUXBPaGQHK1cYUCRyVhw4hYLVKDibS1msQGOSAQwAExqZAmAllxu6eUFDBzw5ZhdlkkmAA0E8JOZbJ6ppQMP/NPmnGdCEMEedOZJSZCASDDPE14EOIpH1ARAnyuE/tlJoopC4ksIAUzQ6DlIECKEpJPyEksoAOyR6S6bYvIpqEhwyumoiJY6hKfmIKlpEp6yOo4H5CgRKTuUWAEMo8icqg6qRPj6KrDM8HpMDLfuSmyxy4bTLDLGPktGtNKKQW21YFyLbTHb/totqd/OEmW45D4SBAA7" v:shapes="_x0000_i1026"/>
A.正弦分量与余弦分量
B.直流分量与正弦分量
C.奇次谐波分量
D.直流分量与余弦分量
10.[单选题] 从S域到Z域的映射中，为保证映射前后滤波器的稳定性不变，则应满足（）
A.s域左半平面映射到z域的单位圆内，虚轴到单位圆外
B.s域左半平面映射到z域的单位圆外，虚轴到单位圆内
C.s域左半平面映射到z域的单位圆外部，虚轴到单位圆
D.s域左半平面映射到z域的单位圆内，虚轴到单位圆
11.[单选题] <img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quiLk3cf58b9c_14ffaafdef7_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2"/>
A.因果稳定
B.因果不稳定
C.非因果稳定
D.非因果不稳定
12.[单选题] 对离散系统系统频率响应仿真，调用的函数是（ ）。
A.step
B.impulse
C.freqs
D.freqz
13.[单选题] 下列系统中，属于线性时不变系统的是（ ）。
A.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff7934397_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2'/>
B.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff793bdc7_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2'/>
C.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff79450e0_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2'/>
D.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff794e34c_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2'/>
14.[单选题] 关于稳定性的描述，下列叙述中错误的是（ ）。
A.稳定的充要条件是有界输入产生有界输出，简称BIBO
B.线性时不变系统的稳定性理论上与输入信号无关
C.稳定性指的是系统克服扰动恢复到平衡态的能力
D.冲激响应可以表征系统的稳定性
15.[单选题] <img src="http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff786db80_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2"/>
A.2
B.4
C.-2
D.-4
16.[单选题] 关于三个变换之间的关系，下列叙述错误的是（）。
A.若原信号收敛，虚轴上的拉氏变换就是傅里叶变换
B.s域的左半平面映射到z域的单位圆内部
C.从s域到z域的映射是单值映射
D.s域的右半平面映射到z域的单位圆外部
17.[单选题] 关于数字频率，下列表达中错误的是（）
A.数字频率的高频为π附近
B.数字频率的低频为0和2π附近
C.数字频率为模拟频率对采样频率归一化的频率
D.数字频率的单位为Hz
18.[单选题] 下列叙述正确的是（）。
A.各种离散信号都是数字信号
B.数字信号的幅度只能取0或1
C.将模拟信号采样直接可得数字信号
D.采样信号经保持、滤波后可得模拟信号
19.[单选题] 关于无失真传输的充要条件，下列叙述中正确的是（）。
A.系统的幅频特性为常数
B.系统的相频特性与频率成正比
C.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLi3cf58b9c_14ff50fe592_OUL&rc=oVdA47x%2B4VctsHYg3UjY2cV%2FVU6vsuPT'/>
D.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLi3cf58b9c_14ff5107170_OUL&rc=oVdA47x%2B4VctsHYg3UjY2cV%2FVU6vsuPT'/>
20.[单选题] 下列信号中属于数字信号的是（）。
A.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLi3cf58b9c_14ff50a34c7_OUL&rc=oVdA47x%2B4VctsHYg3UjY2cV%2FVU6vsuPT'/>
B.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLi3cf58b9c_14ff50abbbe_OUL&rc=oVdA47x%2B4VctsHYg3UjY2cV%2FVU6vsuPT'/>
C.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLi3cf58b9c_14ff50b35be_OUL&rc=oVdA47x%2B4VctsHYg3UjY2cV%2FVU6vsuPT'/>
D.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLi3cf58b9c_14ff50bb295_OUL&rc=oVdA47x%2B4VctsHYg3UjY2cV%2FVU6vsuPT'/>
21.[单选题] 关于傅里叶变换，时域做虚指数加权，频域（）
A.左移
B.尺度
C.右移
D.平移
22.[判断题] 连续信号的移位、翻转、尺度等运算，都是针对独立变量t而言。
A.正确
B.错误
23.[判断题] 利用系统函数不能分析LTI系统在初始条件下的运动变化过程。
A.正确
B.错误
24.[判断题] 由欧拉公式，可以有 <img width="386" height="96" style="width: 176px; height: 39px;" src="data:image/png;base64,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"/>。
A.正确
B.错误
25.[判断题] 时不变性意味着系统的结构与参数不随时间发生改变。
A.正确
B.错误
26.[判断题] <img width="438" height="50" style="width: 306px; height: 35px;" src="data:image/png;base64,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"/>
A.正确
B.错误
27.[判断题] 冲激响应的形式与自由响应、零输入响应的形式基本相同。
A.正确
B.错误
28.[判断题] 可以用迭代法求离散系统的差分方程，但可能得不到闭合形式的解。
A.正确
B.错误
29.[判断题] 借助于零极点的分布，可以分析系统的时域响应与频率响应，建立起结构参数与性能指标之间的关系。
A.正确
B.错误
30.[判断题] 周期冲激串的傅里叶变换仍然是周期冲激串。
A.正确
B.错误
31.[判断题] 通过信号的分解，可以考察基本信号经过系统的响应，从而建立相关的系统数学模型。，
A.正确
B.错误
32.[判断题] 系统函数的阶次总是会不低于状态空间模型的阶次。
A.正确
B.错误
33.[判断题] DFT在时域与频域都是离散、周期的，且两个域周期相等。
A.正确
B.错误
34.[判断题] FIR指冲激响应无限长的模拟滤波器。
A.正确
B.错误
35.[判断题] 确定任一滤波器的性能，需要同时给定四个方面的性能指标。
A.正确
B.错误
36.[判断题] LTI的系统，其系统函数与输入无关，其稳定性也和输入无关。
A.正确
B.错误
37.[判断题] 给定数字系统，应同时给出抽样频率。
A.正确
B.错误
38.[判断题] LTI系统在正弦信号作用下，其稳态输出是同频的正弦信号。
A.正确
B.错误
39.[判断题] 零阶保持抽样后的信号，其频谱仍然是原信号频谱周期延拓并加权得到。
A.正确
B.错误
40.[判断题] 在有限项级数逼近中，会产生吉布斯现象。
A.正确
B.错误
41.[判断题] 符号函数的傅里叶变换为 <img width="58" height="95" style="width: 29px; height: 46px;" src="data:image/png;base64,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"/>。
A.正确
B.错误
42.[判断题] <img width="250" height="112" style="width: 158px; height: 44px;" src="data:image/png;base64,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"/>
A.正确
B.错误
43.[判断题] 规定积分下限从0-开始，冲激信号的拉氏变换为1。
A.正确
B.错误
44.[判断题] 理想模拟滤波器都是物理上不可实现的滤波器。
A.正确
B.错误天津大学作业无忧答案网发布
45.[判断题] 线性相位，指的是系统的相频特性与频率成正比。
A.正确
B.错误
46.[判断题] 实序列的频谱，其幅值偶对称，相位奇对称。
A.正确
B.错误
47.[判断题] 系统为因果系统的充要条件是冲激响应是因果的信号。
A.正确
B.错误
48.[判断题] 经理想冲激采样后的信号可表示为<img width="345" height="123" style="width: 156px; height: 48px;" src="data:image/png;base64,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"/>。
A.正确
B.错误
49.[判断题] 周期信号的频谱具有离散谐波性、收敛性，是密度意义上的频谱。
A.正确
B.错误
50.[判断题] 无论在连续域还是离散域，一个域压缩，都对应了另一个域的扩展。
A.正确
B.错误
51.[判断题] 从s到z的映射，是多值映射，频域可能产生混叠。
A.正确
B.错误
52.[判断题] 连续LTI系统的阶跃响应为<img width="119" height="24" src="data:image/png;base64,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"/>，则该系统稳定。
A.正确
B.错误
53.[判断题] 因果序列z变换的收敛域包含无穷远处。
A.正确
B.错误
54.[判断题] 信号的带宽，指需要考虑的有效频率成分，与信号的时宽成反比。
A.正确
B.错误
55.[判断题] 一般来说，系统的带宽应大于有用信号的带宽。
A.正确
B.错误
56.[判断题] 设<img width="167" height="32" style="width: 109px; height: 25px;" src="data:image/png;base64,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"/>，则<img src="data:image/png;base64,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"/> 。
A.正确
B.错误
57.[判断题] 系统的因果性会影响到系统的稳定性。
A.正确
B.错误
58.[问答题] 利用Matlab分析信号x(t)=Sa(100pi*t)的频谱，如何实现？
A.
59.[问答题] <img src="http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff7b63b87_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2"/>
A.
60.[问答题] 已知周期信号
<img width="476" height="61" style="width: 220px; height: 33px;" 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hzf9ErOycuRL3a8LPsg/Qfe8Sa/Q8D9aWDPWzW+awZBF3hNcm/m+03a4aogPoQ0f4/Q8YCfxeEP7dgsDbccxgmCLvCW7DLRabekqbS9W1amy3VpX1UAbodDug3d3ZxWh+JqTrLH9uaLthGubIwVBF3gJckezo33ZZB/FtwqC/r1wJdL8X23p+mgcz6n93+P9Pt4JExyxwsWUgEAAACOwEwXAAAAcASCLgAAAOAIBF0AAADAEQi6AAAAgCMQdAEAAABHIOgCAAAAjkDQBQAAAJxA9H9E32BzpOr3nAAAAABJRU5ErkJggg=="/>
（１）求该周期信号的周期T和角频率Ω；
（２）该信号非零的谐波有哪些，并指出它们的谐波次数；
（３）画出其幅度谱。

A.
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西南《1073信号与系统》22春作业答案题目