若系统冲激响应为h(t)，下列式中可能是系统函数H(s)的表达式为( )
A:
B:
C:
D:
A:
B:
C:
D:
举一反三
- 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" />
- 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"/>
- 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" />
- 下列信号中，____是能量信号。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/e8fc82c3d7b046fc949119acef31f0f0.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/6085f08fa59b45e0ac501f77d9e9ac5c.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/450d1385152b4c67a5ec0e2e7a8f50d7.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/7a668260d2ea405ea903fc344f3ea5bc.png">
- 下列信号中，______是因果信号。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/56c3db40bb36428688799a6164924c2b.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/c775ed12f5af47549261ce4b9ae7c969.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/1a1575aacbdf4e95882a87cf2a5a7049.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/48b1a932dc504373ab3bf0e87edb513a.png">