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" />

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" />

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" />

四阶龙格-库塔法的局部截断误差为（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/0f0ef82428234797b55f1de00a53ffaf.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/5f6b38bd8de641048c0f113bce5b6a6c.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/cbf6482b137141c0be1b9978d988e314.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/3b71c227f0b44f15b40a06684c2715f5.png" />

下列输入输出关系中，表示非线性、时不变系统的是（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/13190a4383d54997b48eeb58f38f436b.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/2f52d632a75e4c968d71b9986dbe5976.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/e6d430a49ebd45a4b379da4690afdd97.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/e958ba2576fb48b986d14359af116bce.png" />

过3个互异节点<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/c93daa18788043aeba0c4c8d19dc37b6.png" />做拉格朗日插值，关于拉格朗日插值基函数<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/8e5bcb2a9a9c444f8bc3ad4fbe221f53.png" />，下列说法正确的是（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/65e145e64f2a4189b72db6f72f7ba94f.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/854cbb8156c5467d87595bdd4c8e4baf.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/fd8f5422c04a4ddba89f2b32dd4509c8.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202106/1a0ef95dd38648768a995114ca9e4abe.png" />

以下乘积中（ ）是阶行列式<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/82f446b316104687b47a0d14230bd714.png" />中取负号的项。 A: <img src="https://image.zhihuishu.com/zhs/teacherExam_h5/COMMONUEDITOR/202106/90dd3f4ef5a24bd6a7e7a1a3a877693a.jpg" /> B: <img src="https://image.zhihuishu.com/zhs/teacherExam_h5/COMMONUEDITOR/202106/f8b2551716594c8c83947d1b7ce5785f.jpg" /> C: <img src="https://image.zhihuishu.com/zhs/teacherExam_h5/COMMONUEDITOR/202106/7452e9e15a924c6395e138386138d587.jpg" /> D: <img src="https://image.zhihuishu.com/zhs/teacherExam_h5/COMMONUEDITOR/202106/374327e7d1f249a4b3f180c833a68c1a.jpg" />

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" />