1、单选题：
计算 .w64974416349s .brush0 { fill: rgb(255,255,255); } .w64974416349s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416349s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416349s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416349s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64974416349s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } cos(10)cos(30) tt - 的周期T=（ ）。
选项：
A:.w64974416338s .brush0 { fill: rgb(255,255,255); } .w64974416338s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416338s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64974416338s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416338s .font1 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416338s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 3 p
B:.w64974416226s .brush0 { fill: rgb(255,255,255); } .w64974416226s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416226s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64974416226s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416226s .font1 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416226s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 4 p
C:.w64974416240s .brush0 { fill: rgb(255,255,255); } .w64974416240s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416240s .font0 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416240s .font1 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } p
D:.w64974416253s .brush0 { fill: rgb(255,255,255); } .w64974416253s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416253s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64974416253s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416253s .font1 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416253s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 5 p
答案: 【.w64974416253s .brush0 { fill: rgb(255,255,255); } .w64974416253s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416253s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64974416253s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416253s .font1 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416253s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 5 p】

2、单选题：
下列说法正确的是（ ）：
选项：
A:两个周期信号x(t)，y(t)的周期分别为2和 .w64974416196s .brush0 { fill: rgb(255,255,255); } .w64974416196s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416196s .font0 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416196s .font1 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } p ，其和信号x(t)+y(t)是周期信号。
B:两个周期信号x(t)，y(t)的周期分别为2和 .w64974416211s .brush0 { fill: rgb(255,255,255); } .w64974416211s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416211s .pen1 { stroke: rgb(0,0,0); stroke-width: 16; stroke-linejoin: round; } .w64974416211s .pen2 { stroke: rgb(0,0,0); stroke-width: 32; stroke-linejoin: round; } .w64974416211s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416211s .font1 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 2 ，则信号x(t)+y(t) 是周期信号。
C:两个周期信号x(t)，y(t)的周期分别为2和3，其和信号x(t)+y(t)是周期信号。
D:两个周期信号x(t)，y(t)的和x(t)+y(t)一定是周期信号。
答案: 【两个周期信号x(t)，y(t)的周期分别为2和3，其和信号x(t)+y(t)是周期信号。】

3、单选题：
下列说法不正确的是（ ）。
选项：
A:u(t)是功率信号；
B:et为能量信号
C:时限信号(仅在有限时间区间不为零的非周期信号)为能量信号。
D:一般周期信号为功率信号。
答案: 【et为能量信号】

4、单选题：
已经信号f(t)如下图所示，其反转右移的信号f₁(t)是（ ）

选项：
A:
B:
C:
D:
答案: 【】

5、多选题：
为得到x(−2t+4)，可以将x(t)经过下列哪种运算（ ）
选项：
A:x(t)右移2后再翻转压缩成原来的一半
B:x(t)翻转压缩成原来的一半后，右移2
C:x(t)翻转压缩后成原来的一半后，左移2
D:x(t)左移4后再翻转压缩成原来的一半
答案: 【x(t)翻转压缩成原来的一半后，右移2;
x(t)左移4后再翻转压缩成原来的一半】

6、单选题：
.w64974416167s .brush0 { fill: rgb(255,255,255); } .w64974416167s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416167s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64974416167s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416167s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416167s .font2 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416167s .font3 { font-size: 241px; font-family: Symbol, serif; } .w64974416167s .font4 { font-size: 373px; font-family: Symbol, serif; } .w64974416167s .font5 { font-size: 530px; font-family: Symbol, serif; } .w64974416167s .font6 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } (sin)() 6 tttdt p d ¥ -¥ +- ò = （ ）。
选项：
A:.w64974416131s .brush0 { fill: rgb(255,255,255); } .w64974416131s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416131s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64974416131s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416131s .font1 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416131s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64974416131s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 1 2 p +
B:.w64974416143s .brush0 { fill: rgb(255,255,255); } .w64974416143s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416143s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64974416143s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416143s .font1 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416143s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64974416143s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 1 52 p +
C:.w64974416155s .brush0 { fill: rgb(255,255,255); } .w64974416155s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416155s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64974416155s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416155s .font1 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416155s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64974416155s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 1 32 p +
D:.w64974416119s .brush0 { fill: rgb(255,255,255); } .w64974416119s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416119s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64974416119s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416119s .font1 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416119s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64974416119s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 1 62 p +
答案: 【.w64974416119s .brush0 { fill: rgb(255,255,255); } .w64974416119s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416119s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64974416119s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416119s .font1 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416119s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64974416119s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 1 62 p +】

7、单选题：
下列关于冲激函数性质的表达式不正确的是（ ）。
选项：
A:.w64974416084s .brush0 { fill: rgb(255,255,255); } .w64974416084s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416084s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416084s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416084s .font2 { font-style: italic; font-size: 262px; font-family: "Times New Roman", serif; } .w64974416084s .font3 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416084s .font4 { font-size: 373px; font-family: Symbol, serif; } .w64974416084s .font5 { font-size: 530px; font-family: Symbol, serif; } .w64974416084s .font6 { font-size: 242px; font-family: Symbol, serif; } .w64974416084s .font7 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ) ( d ) ( t t e t t d = ò ¥ -
B:.w64974416075s .brush0 { fill: rgb(255,255,255); } .w64974416075s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416075s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416075s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416075s .font2 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416075s .font3 { font-size: 373px; font-family: Symbol, serif; } .w64974416075s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ) ( ) - ( t t d d =
C:.w64974416108s .brush0 { fill: rgb(255,255,255); } .w64974416108s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416108s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416108s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416108s .font2 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416108s .font3 { font-size: 373px; font-family: Symbol, serif; } .w64974416108s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ) ( ) 0 ( ) ( ) ( t f t t f d d =
D:.w64974416096s .brush0 { fill: rgb(255,255,255); } .w64974416096s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416096s .pen1 { stroke: rgb(0,0,0); stroke-width: 16; stroke-linejoin: round; } .w64974416096s .font0 { font-size: 473px; font-family: Symbol, serif; } .w64974416096s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416096s .font2 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416096s .font3 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416096s .font4 { font-size: 373px; font-family: Symbol, serif; } .w64974416096s .font5 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ( ) t a at d d 1 ) ( =
答案: 【.w64974416096s .brush0 { fill: rgb(255,255,255); } .w64974416096s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416096s .pen1 { stroke: rgb(0,0,0); stroke-width: 16; stroke-linejoin: round; } .w64974416096s .font0 { font-size: 473px; font-family: Symbol, serif; } .w64974416096s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416096s .font2 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416096s .font3 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416096s .font4 { font-size: 373px; font-family: Symbol, serif; } .w64974416096s .font5 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ( ) t a at d d 1 ) ( =】

8、单选题：
已知信号 .w64974416362s .brush0 { fill: rgb(255,255,255); } .w64974416362s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416362s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416362s .font1 { font-size: 262px; font-family: "Times New Roman", serif; } .w64974416362s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64974416362s .font3 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416362s .font4 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416362s .font5 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } )] 2 ( ) ( )[ 2 ( )] ( ) 2 ( [ 2 ) ( 1 - - + + - + = t t t t t t f e e e e ，则 .w64974416094s .brush0 { fill: rgb(255,255,255); } .w64974416094s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416094s .pen1 { stroke: rgb(0,0,0); stroke-width: 16; stroke-linejoin: round; } .w64974416094s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416094s .font1 { font-size: 373px; font-family: Symbol, serif; } .w64974416094s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416094s .font3 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416094s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } )] 1 ( ) 2 1 ( )[ 2 1 ( ) ( - - + - = t t t f t f e e 的波形是（ ）。
选项：
A:
B:
C:
D:
答案: 【】

9、多选题：
.w64974416340s .brush0 { fill: rgb(255,255,255); } .w64974416340s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416340s .font0 { font-size: 579px; font-family: Symbol, serif; } .w64974416340s .pen1 { stroke: rgb(0,0,0); stroke-width: 16; stroke-linejoin: round; } .w64974416340s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416340s .font2 { font-style: italic; font-size: 262px; font-family: "Times New Roman", serif; } .w64974416340s .font3 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416340s .font4 { font-size: 262px; font-family: "Times New Roman", serif; } .w64974416340s .font5 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416340s .font6 { font-size: 242px; font-family: Symbol, serif; } .w64974416340s .font7 { font-size: 373px; font-family: Symbol, serif; } .w64974416340s .font8 { font-size: 374px; font-family: 宋体; } .w64974416340s .font9 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } [ ] dt t e d t t ) ( ) 1 2 d - - （ 的计算值等于（ ）。
选项：
A:.w64974416291s .brush0 { fill: rgb(255,255,255); } .w64974416291s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416291s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416291s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416291s .font2 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416291s .font3 { font-size: 373px; font-family: Symbol, serif; } .w64974416291s .font4 { font-size: 374px; font-family: 宋体; } .w64974416291s .font5 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } )] ( ) ( 2 )[ 1 t t t d d ¢ + - - （
B:.w64974416314s .brush0 { fill: rgb(255,255,255); } .w64974416314s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416314s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416314s .font1 { font-size: 262px; font-family: "Times New Roman", serif; } .w64974416314s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416314s .font3 { font-style: italic; font-size: 262px; font-family: "Times New Roman", serif; } .w64974416314s .font4 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416314s .font5 { font-size: 373px; font-family: Symbol, serif; } .w64974416314s .font6 { font-size: 242px; font-family: Symbol, serif; } .w64974416314s .font7 { font-size: 374px; font-family: 宋体; } .w64974416314s .font8 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } )] ( ) ( 2 )[ 1 2 2 t e t e t t t d d ¢ + - - - - （
C:.w64974416302s .brush0 { fill: rgb(255,255,255); } .w64974416302s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416302s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416302s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416302s .font2 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416302s .font3 { font-size: 373px; font-family: Symbol, serif; } .w64974416302s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ) ( ) ( t t d d ¢ +
D:.w64974416326s .brush0 { fill: rgb(255,255,255); } .w64974416326s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416326s .font0 { font-size: 488px; font-family: Symbol, serif; } .w64974416326s .pen1 { stroke: rgb(0,0,0); stroke-width: 16; stroke-linejoin: round; } .w64974416326s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416326s .font2 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416326s .font3 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416326s .font4 { font-size: 373px; font-family: Symbol, serif; } .w64974416326s .font5 { font-size: 374px; font-family: 宋体; } .w64974416326s .font6 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } [ ] dt t d t ) ( ) 1 d - （
答案: 【.w64974416314s .brush0 { fill: rgb(255,255,255); } .w64974416314s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416314s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416314s .font1 { font-size: 262px; font-family: "Times New Roman", serif; } .w64974416314s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416314s .font3 { font-style: italic; font-size: 262px; font-family: "Times New Roman", serif; } .w64974416314s .font4 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416314s .font5 { font-size: 373px; font-family: Symbol, serif; } .w64974416314s .font6 { font-size: 242px; font-family: Symbol, serif; } .w64974416314s .font7 { font-size: 374px; font-family: 宋体; } .w64974416314s .font8 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } )] ( ) ( 2 )[ 1 2 2 t e t e t t t d d ¢ + - - - - （ ;
.w64974416302s .brush0 { fill: rgb(255,255,255); } .w64974416302s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416302s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416302s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416302s .font2 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416302s .font3 { font-size: 373px; font-family: Symbol, serif; } .w64974416302s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ) ( ) ( t t d d ¢ + ;
.w64974416326s .brush0 { fill: rgb(255,255,255); } .w64974416326s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416326s .font0 { font-size: 488px; font-family: Symbol, serif; } .w64974416326s .pen1 { stroke: rgb(0,0,0); stroke-width: 16; stroke-linejoin: round; } .w64974416326s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416326s .font2 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416326s .font3 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416326s .font4 { font-size: 373px; font-family: Symbol, serif; } .w64974416326s .font5 { font-size: 374px; font-family: 宋体; } .w64974416326s .font6 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } [ ] dt t d t ) ( ) 1 d - （】

10、多选题：
sgn(t)信号的表达式为（ ）
选项：
A:.w64974416288s .brush0 { fill: rgb(255,255,255); } .w64974416288s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416288s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416288s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416288s .font2 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416288s .font3 { font-size: 373px; font-family: Symbol, serif; } .w64974416288s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 2()1 t e --+
B:.w64974416300s .brush0 { fill: rgb(255,255,255); } .w64974416300s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416300s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416300s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416300s .font2 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416300s .font3 { font-size: 373px; font-family: Symbol, serif; } .w64974416300s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ()() tt ee --
C:.w64974416325s .brush0 { fill: rgb(255,255,255); } .w64974416325s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416325s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416325s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416325s .font2 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416325s .font3 { font-size: 373px; font-family: Symbol, serif; } .w64974416325s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ()() tt ee +-
D:.w64974416312s .brush0 { fill: rgb(255,255,255); } .w64974416312s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416312s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416312s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416312s .font2 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416312s .font3 { font-size: 373px; font-family: Symbol, serif; } .w64974416312s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 2()1 t e -
答案: 【.w64974416288s .brush0 { fill: rgb(255,255,255); } .w64974416288s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416288s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416288s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416288s .font2 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416288s .font3 { font-size: 373px; font-family: Symbol, serif; } .w64974416288s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 2()1 t e --+ ;
.w64974416300s .brush0 { fill: rgb(255,255,255); } .w64974416300s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416300s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416300s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416300s .font2 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416300s .font3 { font-size: 373px; font-family: Symbol, serif; } .w64974416300s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ()() tt ee -- ;
.w64974416312s .brush0 { fill: rgb(255,255,255); } .w64974416312s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416312s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416312s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416312s .font2 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416312s .font3 { font-size: 373px; font-family: Symbol, serif; } .w64974416312s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 2()1 t e -】

11、单选题：
设系统零状态响应与激励的关系是： .w64974416276s .brush0 { fill: rgb(255,255,255); } .w64974416276s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416276s .pen1 { stroke: rgb(0,0,0); stroke-width: 16; stroke-linejoin: round; } .w64974416276s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416276s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416276s .font2 { font-style: italic; font-size: 262px; font-family: "Times New Roman", serif; } .w64974416276s .font3 { font-size: 373px; font-family: Symbol, serif; } .w64974416276s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ) ( ) ( t f t y zs = ，则以下表述不对的是（ ）
选项：
A:系统是稳定的
B:系统是线性的
C:系统是因果的
D:系统是时不变的
答案: 【系统是线性的】

12、单选题：
下列微分或差分方程所描述的系统为线性时不变系统的是（ ）
选项：
A:.w64974416224s .brush0 { fill: rgb(255,255,255); } .w64974416224s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416224s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64974416224s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416224s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416224s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64974416224s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ()3(1)2() ykykfk +-=
B:.w64974416238s .brush0 { fill: rgb(255,255,255); } .w64974416238s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416238s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416238s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416238s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64974416238s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ()(1)(2)() ykykykfk +--=
C:.w64974416251s .brush0 { fill: rgb(255,255,255); } .w64974416251s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416251s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416251s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416251s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64974416251s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } '()3()'()2() ytytftft +=+
D:.w64974416264s .brush0 { fill: rgb(255,255,255); } .w64974416264s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416264s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416264s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416264s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64974416264s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } '()2()() ytytft +=-
答案: 【.w64974416251s .brush0 { fill: rgb(255,255,255); } .w64974416251s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416251s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416251s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416251s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64974416251s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } '()3()'()2() ytytftft +=+】

13、判断题：
若系统激励信号为e(t)，响应信号r(t)，则系统 .w64974416209s .brush0 { fill: rgb(255,255,255); } .w64974416209s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416209s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416209s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416209s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64974416209s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ()cos(100)() rttet = 是线性时变系统。（ ）
选项：
A:对
B:错
答案: 【对】

14、判断题：
若系统激励信号为e(t)，响应信号r(t)，则系统 .w64974416250s .brush0 { fill: rgb(255,255,255); } .w64974416250s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416250s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416250s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416250s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64974416250s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ()(-) rtet = 是因果系统。（ ）
选项：
A:错
B:对
答案: 【错】

15、单选题：
试判断系统 .w64974416236s .brush0 { fill: rgb(255,255,255); } .w64974416236s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64974416236s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64974416236s .font1 { font-style: italic; font-size: 260px; font-family: "Times New Roman", serif; } .w64974416236s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64974416236s .font3 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64974416236s .font4 { font-size: 241px; font-family: Symbol, serif; } .w64974416236s .font5 { font-size: 373px; font-family: Symbol, serif; } .w64974416236s .font6 { font-size: 530px; font-family: Symbol, serif; } .w64974416236s .font7 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ()()() t ytxtxd tt -¥ =+ ò 特性，其中y(0)为初始条件，x(t)为输入信号，y(t)为输出信号。（ ）
选项：
A:线性时不变
B:线性时变
C:非线性时不变
D:非线性时变
答案: 【线性时不变】