矩阵
的非零特征值为（）
A: 3
B: 2
C: -3
D: 1
的非零特征值为（）A: 3
B: 2
C: -3
D: 1
举一反三
- 矩阵<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202109/b2d3dd9426d64befb6c733c89e7765d9.png" />的非零特征值是（ ） A: 1 B: 2 C: 4 D: 3
- 设函数<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/383ac45893484801984d005d9e826c63.png" >在以原点为中心的圆环内的洛朗展式有<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/554aee69970a4a03a85f2006f931ecbd.png" >个，那么<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/ce6ea8253d7d493fb851c8f3d5ab763e.png" >()。 A: 1 B: 3 C: 2 D: 4
- Z12-01-02.在匀强磁场中,有两个平面线圈,其面积<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/fd517dda88774d7ea84db8b1717c08eb.png" >,通有电流<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/8475b9c5847343639c4d11b61bb63cbd.png" >,它们所受的最大磁力矩之比<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/c8609aee65b64279994bacc403aaacc2.png" >等于() A: 4 B: 1 C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/7e1b17ff518a4b519442aacb596c4415.png" > D: 2
- 已知<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/022be9febdbf4485b8e30dd813a50286.png" />溶液的氢离子浓度是<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/1c86b20811cc4194b4da92dd5ae66240.png" />溶液的氢离子的浓度的（ ）。 A: 1/8 B: 1/4 C: 1/2 D: 1/6
- 基2频率抽取FFT算法中时域序列分解的蝶形图是（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/7ca0b619afd44022bf8ce67c67afd54d.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/c9e44ade5dd4492f8ff9296540f4860a.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/c24a7ec44e3b4bfc8b08bb120429ff18.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202008/1f93041df7124232ae9c76f2ebc8fc4c.png" />