设是满足的任意两个非零矩阵，则必有（ ）http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/df8b218bd1cf4c6da212c30ec1c8612b.png
举一反三
- 设是秩为的矩阵，且，则非齐次线性方程组（ ）.http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/5134ea2c25cc42a9addee7e9f36ac8ed.png
- 波长为<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/91ddb92399a343cc990e393ea7ae49e4.png" />的单色光垂直入射于光栅常数为d、缝宽为a、总缝数为N的光栅上。取<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/d02f9b0d40604921bb6eba164d27ae52.png" />，则决定出现主极大的衍射角<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/294d963ff1564c7e9c98a2ca06a7278c.png" />的公式可写成（ ）。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/7e2fd47a37564a53afe33f3fadb46a41.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/2c25a6b55e74467992e1b3b1d02662d8.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/f852c846c7b642f6bbcaf2bcfa75c310.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/27465a93e5ca42d8a18f9a3222d0e52b.png" />
- 设矩阵 有特征值 ，对应的特征向量为 ， 为（ ）.http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/0f4af44de4bd49b4964eddda18a0be0c.png
- http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/1bddce95fbb240e1bbbeee3a4a066c5d.png
- http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/e5c3ed68bc434cd28fefaabd46deec74.png