已知某离散系统的差分方程为y(n)+3y(n-1)+2y(n-2)=2x(n-1)+6x(n-2)，求系统的传输算子H（E）
A:
B:
C:
D:
A:
B:
C:
D:
举一反三
- 函数Y=AB+AC的最小项表达式为: （ ） A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/513c2f01af7d407daa80adcc252243b0.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/2a22507a9a71450db4763f911c8da08a.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/3112343cb6d44720a379a8fd1903c29e.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/62420a24b7374ebd9169f3ad94897f4a.png" />
- 读装配图中零件10，下列哪个图是正确的 （ ）<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/3e06ba277c804a0184232a92dc4daae8.png"/> A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/f552fe75449e4a54ac92d376ccb56c4d.png"/> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/ceee8794adba4c09a22636cc1400760a.png"/> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/de760892beba4aa0b43f5ad85fa1a8e3.png"/> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/bd80973d489b4003904efdee208828b2.png"/> E: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/3206dcc5d56c4536b359f5b66ae1fe03.png"/>
- 下列系统中，_______是线性的。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/69188060fb4c48d68700d5224ce70e53.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/66e06f948fa34740a90a8c1cc227c6b6.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/4c264641de7b410e873171e90fd444ef.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/a3f710b25c2248b48ed5f6f1d342c078.png" />
- 电子显微镜的分辨率可达到在（） A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/41606c058d104fe3a157df1c821c6950.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/df2b0f80acc349779789c6d508af4e3d.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/6863b36a8c7e452a8668a5dacff64282.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/6fb394a51b584fc3a9db13fa9c5a7299.png" />
- 下面哪一个必定是错误的（ ） A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/ec78b3caad34427297f9ecfdaafbefff.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/2ed85e95d14c40c3b73214e3a200746a.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/aed12e27a9934e6da5aa4b97f47786d6.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/c82a69a1467d423caa27e593e84c9bad.png" />