下列输入输出关系中，表示非线性、时不变系统的是（ ）。
A:
B:
C:
D:
A:
B:
C:
D:
举一反三
- 下列结论正确的是（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/a856baf4b0f0469ba1c843c38014fbaf.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/03b701069cb5491ea6d322b1137ea1b1.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/70bbea678e9a48ec89c55324ac028724.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/82621de9dc1647349cef899ac08c4d5b.png" />
- 下列可作为权函数的有（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/3c8e065875ff4d2cb0105d58f9774bd5.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/f76bd769569d40f0ae686b79b0534365.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/4518bb26aa7b47aba90fa13c85e910ea.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/00c4e0ef929740c490c3714b8806118f.png" />
- 下列z变换对中正确的是( ) A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/35e830c28e8d4674b57d451c7e17adc8.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/bc3bb77eab15451ca5caaa93392c8796.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/4c146477f65d4bbcb6e6def394c079fa.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/03c95bafc66e4863801a3bcce4e84adc.png" />
- 下列信号属于能量信号的是（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/7c965cdf9df04f47872be8ea877ee37d.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/c3eaaa92092e496a8a51ba8c5b1451b3.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/8639fb002bd1413794aed7bb1e514d9a.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/8640d393aedf45c19ce6f3092ead7c1f.png" />
- 欧拉方法的局部截断误差为（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/89ca3cd8167049bca01e6038b65fed85.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/64c3f23ca2da42f9bab5fc959ed974cf.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/c4b4ed9a138d44f38893b7a00cfc824c.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/0f0ef82428234797b55f1de00a53ffaf.png" />