第一章 单元测试

1、单选题：
若 为系统的输入信号， 为系统的零状态响应，则下列系统中（ ）是非时变系统。
选项：
A:.w66685962255s .brush0 { fill: rgb(255,255,255); } .w66685962255s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w66685962255s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w66685962255s .font1 { font-style: italic; font-size: 260px; font-family: "Times New Roman", serif; } .w66685962255s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w66685962255s .font3 { font-size: 373px; font-family: Symbol, serif; } .w66685962255s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } []0.5[] k ykxk =
B:
C:.w66685962275s .brush0 { fill: rgb(255,255,255); } .w66685962275s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w66685962275s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w66685962275s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w66685962275s .font2 { font-size: 373px; font-family: Symbol, serif; } .w66685962275s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ()() yttxt =
D:.w66685962232s .brush0 { fill: rgb(255,255,255); } .w66685962232s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w66685962232s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w66685962232s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w66685962232s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w66685962232s .font2 { font-size: 373px; font-family: Symbol, serif; } .w66685962232s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } () ()2 dxt yt dt =
答案: 【.w66685962232s .brush0 { fill: rgb(255,255,255); } .w66685962232s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w66685962232s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w66685962232s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w66685962232s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w66685962232s .font2 { font-size: 373px; font-family: Symbol, serif; } .w66685962232s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } () ()2 dxt yt dt =】

2、单选题：
已知描述离散时间系统的输入输出关系如下，其中 为输入信号、 为输出信号， 为系统的初始状态，这些系统中（ ）不是线性系统。
选项：
A:
B:
C:
D:
答案: 【】

3、判断题：
若描述离散时间系统的差分方程为 ，该系统是因果线性时不变系统。（ ）
选项：
A:错
B:对
答案: 【对】

4、判断题：
连续时间周期信号 的周期 为 。（ ）
选项：
A:对
B:错
答案: 【对】

5、单选题：
下列信号的分类方法不正确的是（ ）：
选项：
A:数字信号和离散信号
B:确定信号和随机信号
C:因果信号与反因果信号
D:周期信号和非周期信号
答案: 【数字信号和离散信号】

6、单选题：
下列说法正确的是（ ）：
选项：
A:两个周期信号 ， 的周期分别为2和 ，则其和信号 是周期信号
B:两个周期信号 ， 的周期分别为2和 ，其和信号 是周期信号
C:两个周期信号 ， 的周期分别为2和3，其和信号 是周期信号
D:两个周期信号 ， 的和 一定是周期信号
答案: 【两个周期信号 ， 的周期分别为2和3，其和信号 是周期信号】

第二章 单元测试

1、单选题：
正弦信号 可用相同周期的虚指数信号 表示为（ ）。
选项：
A:
B:
C:
D:
答案: 【】

2、单选题：
已知信号 如图所示，可以表示为（ ）。

选项：
A:.w66685962274s .brush0 { fill: rgb(255,255,255); } .w66685962274s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w66685962274s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w66685962274s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w66685962274s .font2 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w66685962274s .font3 { font-size: 373px; font-family: Symbol, serif; } .w66685962274s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } sin[(1)](1) tut p --
B:.w66685962295s .brush0 { fill: rgb(255,255,255); } .w66685962295s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w66685962295s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w66685962295s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w66685962295s .font2 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w66685962295s .font3 { font-size: 373px; font-family: Symbol, serif; } .w66685962295s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } sin()(1) tut p -
C:.w66685962254s .brush0 { fill: rgb(255,255,255); } .w66685962254s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w66685962254s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w66685962254s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w66685962254s .font2 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w66685962254s .font3 { font-size: 373px; font-family: Symbol, serif; } .w66685962254s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } sin[(1)]() tut p -
D:.w66685962239s .brush0 { fill: rgb(255,255,255); } .w66685962239s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w66685962239s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w66685962239s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w66685962239s .font2 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w66685962239s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } sin()() tut p
答案: 【.w66685962295s .brush0 { fill: rgb(255,255,255); } .w66685962295s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w66685962295s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w66685962295s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w66685962295s .font2 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w66685962295s .font3 { font-size: 373px; font-family: Symbol, serif; } .w66685962295s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } sin()(1) tut p -】

3、单选题：
信号 的值为（ ）。
选项：
A:
B:
C:
D:
答案: 【】

4、单选题：
积分 的值为（ ）。
选项：
A:2
B:4
C:0
D:-4
答案: 【0】

5、单选题：
下面的关系中，错误的是（ ）。
选项：
A:
B:
C:
D:
答案: 【】

6、单选题：
已知信号 的波形如图所示，下列表达式中错误的是（ ）。
选项：
A:.w66685962298s .brush0 { fill: rgb(255,255,255); } .w66685962298s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w66685962298s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w66685962298s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w66685962298s .font2 { font-size: 373px; font-family: Symbol, serif; } .w66685962298s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } [1][2][3][4]4[5] ukukukukuk -+-+-+---
B:.w66685962277s .brush0 { fill: rgb(255,255,255); } .w66685962277s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w66685962277s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w66685962277s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w66685962277s .font2 { font-size: 373px; font-family: Symbol, serif; } .w66685962277s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } {[][4]} kukuk --
C:.w66685962074s .brush0 { fill: rgb(255,255,255); } .w66685962074s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w66685962074s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w66685962074s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w66685962074s .font2 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w66685962074s .font3 { font-size: 373px; font-family: Symbol, serif; } .w66685962074s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } [1]2[2]3[3]4[4] kkkk dddd -+-+-+-
D:.w66685962257s .brush0 { fill: rgb(255,255,255); } .w66685962257s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w66685962257s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w66685962257s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w66685962257s .font2 { font-size: 373px; font-family: Symbol, serif; } .w66685962257s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } {[][5]} kukuk --
答案: 【.w66685962277s .brush0 { fill: rgb(255,255,255); } .w66685962277s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w66685962277s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w66685962277s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w66685962277s .font2 { font-size: 373px; font-family: Symbol, serif; } .w66685962277s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } {[][4]} kukuk --】

7、单选题：
已知信号 的波形如图所示，可以用 和 表示为（ ）。
选项：
A:
B:
C:
D:
答案: 【】

8、判断题：
冲激信号可以由阶跃信号求导得到。（ ）
选项：
A:对
B:错
答案: 【对】