（ ） ，所以我们使用单位冲激响应h（t）来表征LTI系统特性。A: 是周期连续的
B: 便于采样
C: 是正交信号
D: 含有所有频率分量
举一反三
- 因为单位冲激信号δ( )，所以我们使用单位冲激响应来表征LTI系统特性。1bc4e417c7b0d75fe9298989d2bf54ff
- 两个单位冲激响应分别为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/b1f29e9ad1e54df9970c1be374e67572.png"/>和<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/4c734b95e1024abfbc0741fb7c5455e2.png"/>的LTI系统并联构成的系统的单位冲激响应是<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/d7c571b4af814da7997bc653b0fbe308.png"/>。
- 信号通过单位冲激响应为的LTI系统，输出等于（ ） 。https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/f6cb0e4770dd46459497fe9b56a87710.png
- 信号<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/c67ef484b9f44325881bb93d513d4b28.png"/>通过单位冲激响应是<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/9f31696ca833480fb881cbc3523f3db2.png"/>的LTI系统，<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/fd12806eeb5c4e898fe9689b48dffd73.png"/>，下列说法错误的是？ A: 如果对h（t）进行换元反转及时移操作，则卷积积分的被积函数是1+T-t B: 求0＜t＜1时的y（t）时，卷积积分的积分区间为（0，t） C: 当1＜t＜2时，<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/3a5bd3e706d5413f8edd6da0a8722c45.png"/> D: 当t＜0或t＞2时，y（t）=0
- 下列方程所描述的系统中（ ）是线性时不变系统。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/5740348e23d246eebda0442284882d6d.png"/> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/87c5df9c28f54b398bbedc5da45e7a02.png"/> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/ece1036e5a3c410e8f8b3de147910c04.png"/> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/69fc98a558ce4f3eb743c68be74cf923.png"/>
内容
- 0
x(t)的频谱为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/5bcfe4175fcb4fabbdb5f40d00b5343e.png"/>，则<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/45b1670ebd6245ff99cc376a8048a645.png" />的频谱为（ ） A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/09bc7326832a4a1fba983e74c6d85d35.png"/> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/95fca346a74e4a6cbba601cd6d9e26bf.png"/> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/6bf6b83111ad45efac7eb9a37a245c68.png"/> D: 其余选项都不对
- 1
历史曲线构件的图标是( )。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/dfb6b619f35547c590f6e6c6aab95b3f.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/e7e0aaa5f6e84ba89410cc93b06a451a.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/354425393230484ab64d64a718bd9bad.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/1f794e99ed004e3190fa5181c32fe4e8.png" />
- 2
下面的表达式中，正确有？ A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/0e169fdf5e354dd4af80ea6386ddeca5.png"/> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/5124889b558b4186ba4140ca7692d717.png"/> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/f3d2d0d80b744f74899371cae0395a71.png"/> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/2af6ef9203e94ea2b993e1ad4d99e5d2.png"/>
- 3
下列信号中，_____周期信号。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/5f333529a6724b348f3719d4ad9cb2a7.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/baaca1beb7ea457eaf7544beec0fa639.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/2a8d2203eb2948ce8d95e650e32130f2.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/a2d52c07e1c54524b53b98cd92d39815.png">
- 4
MCGS嵌入版组态软件历史表格的图标是( )。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/536f0628f8c34abe91a754f840ab6b48.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/711a0648935040e29e0ad51df9aab912.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/8eac11daec78403c8885400b32c65dc1.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/23d6fb88adca49ad9982ea9a4381efab.png" />