设n阶方阵A满足，则A必有一个特征值为（ ）.http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/83865bb08c1540549089921355cb9e5f.png
举一反三
- 方阵的特征值是( ).http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/c881896a10624002b0ddc65eaae03c60.png
- 设A的特征多项式，则（ ）.http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/9149eab0d6d24bd387a160b6a63adb67.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" />
- 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" />
- 一定量的理想气体，在温度不变的条件下，当压强降低时，分子的平均碰撞频率<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/5499a59dc3754bfdbf231e19c5e2edb9.png" />和平均自由程<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/bba421d6506c4072b583fd4e63b5df81.png" />的变化情况是（ ）： A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/5499a59dc3754bfdbf231e19c5e2edb9.png" />和<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/bba421d6506c4072b583fd4e63b5df81.png" />都减小． B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/5499a59dc3754bfdbf231e19c5e2edb9.png" />减小而<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/bba421d6506c4072b583fd4e63b5df81.png" />增大． C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/5499a59dc3754bfdbf231e19c5e2edb9.png" />和<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/bba421d6506c4072b583fd4e63b5df81.png" />都增大． D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/5499a59dc3754bfdbf231e19c5e2edb9.png" />增大而<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/bba421d6506c4072b583fd4e63b5df81.png" />减小．