因果序列f (k)的z变换
，则f(0)的值为( )
A: 0.5
B: 1
C: 3
D: 不存在
，则f(0)的值为( )A: 0.5
B: 1
C: 3
D: 不存在
举一反三
- 已知f(k)的z变换<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/fcb29424b0f74f9d8bf5e13ec738f383.png" />，F(z)的收敛域为下面哪一项时，f(k)为因果序列 ( )。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/a75ad7c5eb8849f6a24916fc871c1739.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/3e62806a63e74e78bb29212d2a5bef0a.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/25250b041bec4d5093675240862554e4.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/2eae229138be4af5a084d0996e2d57d2.png" />
- 以下列4个信号的拉普拉斯变换，不存在傅里叶变换的是( ) A: 1 B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/8851fc1d1d25423f99532d86a4ab00fc.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/0aebd05182244a7692c57e132a11aeeb.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/2c0c1185c38e4c119d3827ce6d608550.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" />
- 已知因果序列的z变换<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/b97f2207b1f446acb5232b008ca04e1f.png" />，若满足条件，求终值<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/976e25fceb1344229df9333d1bbbed49.png" />（ ） A: 3 B: 2 C: 1 D: 0
- 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" />