设A为阵，其秩为r，则当时，下列结论错误的是（ ）.http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/951786de33bc478ca2bdf63278a6e5a9.png
举一反三
- 设A为阵，其秩为r，则当r=m时，下列结论错误的是（ ）.http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/8b43ab9dd5db4034a51ff166890bfd98.png
- 设某微观粒子的相对论动量是它非相对论动量的<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/f04bc52895444aa9bf3ce69591507d4b.png" />倍，则其运动速度的大小为：（ c 表示真空中的光速）（ ）。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/39876687533246689c09bf2af4be1fe2.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/dd046c8367ec4635b34aaad5ceffe48b.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/99f25f4748cf434c96c5fa7552098ff5.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/85033bc491434663a83ffea2611f0c2b.png" />
- 设，矩阵，，其中E为n阶单位阵，则BC等于().http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/639791db15504432a1d753ce6bddbdfa.png
- 设A为矩阵，且A的行向量组的秩为3，则方程组AX=b（ ）.http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/bd3d4159077049b3893b52f2e7d10ec9.png
- 在电感元件的交流电路中，已知<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/a818ffec501541eaacdc3fd4b3458bfa.png" />，则（ ）。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/70961d125a8a493cbdbd3169e8655336.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/65f4ae24f45041548b04d5bb8c113767.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/20d9ff741d534721b621dfe04fb3b2bd.png" />