【简答题】
查看正确答案A、已知，<img src="https://img.ppkao.com/2019-05/liuye/2019051616504321415.jpg" />试证此时复能量定理为
<img src="https://img.ppkao.com/2019-05/liuye/2019051616510927939.jpg" />
搜题
更多“ 试证<img src="https://nimg.ppkao.com/2019-05/wuacheng/2019050917021056467.jpg?sign=3b2e9f93d54b714f5eacb967bced53cc&t=62d6ecce" />能满足相容方程，并考察它在下图所示矩形板和坐标系中能解决什么问题（设矩形板的长度为l，深度为h，体力不计）。<br /> <img src="https://nimg.ppkao.com/2019-05/wuacheng/2019050917022478683.jpg?sign=d1ac7ea6f3cf1740efe5ca7266631846&t=62d6ecce" />”相关的问题
第1题
第3题
A、若标量函数为<img src="https://img.ppkao.com/2019-04/liuye/2019041515430278531.jpg" />试求在P（1，-2，1）点处的梯度
第4题
A、试证当点电荷q位于无限大的导体平面附近时，导体表面上总感应电荷等于（-q）
<img src="https://img.ppkao.com/2019-04/liuye/2019042416463759428.jpg" />
第5题
A、A.<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309154866509.jpg" />低电平，<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309155838776.jpg" />三态，<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309155342124.jpg" />低电平
B.<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309154866509.jpg" />三态，<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309155838776.jpg" />低电平，<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309155342124.jpg" />高电平
C.<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309154866509.jpg" />低电平，<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309155838776.jpg" />高电平，<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309155342124.jpg" />高电平
D.<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309154866509.jpg" />高电平，<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309155838776.jpg" />低电平，<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309155342124.jpg" />高电平
第6题
A、一炮弹质量为m，以速度<img src="https://img.ppkao.com/2019-05/wuacheng/2019051616564411192.jpg" />飞行，其内部炸药使此炮弹分裂为两块，爆炸后由于炸药使弹片增加的动能为T，且一块的质量为另一块质量的k倍，如两者仍沿原方向飞行，试证其速率分别为<img src="https://img.ppkao.com/2019-05/wuacheng/2019051616570040187.jpg" />
第7题
A、A.<img src="https://img.ppkao.com/2017-12/xieqiushi/2017120716370781231.jpg" />不变，<img src="https://img.ppkao.com/2017-12/xieqiushi/2017120716372262539.jpg" />增大
B.<img src="https://img.ppkao.com/2017-12/xieqiushi/2017120716370781231.jpg" />减小，<img src="https://img.ppkao.com/2017-12/xieqiushi/2017120716372262539.jpg" />不变
C.<img src="https://img.ppkao.com/2017-12/xieqiushi/2017120716370781231.jpg" />减小，<img src="https://img.ppkao.com/2017-12/xieqiushi/2017120716372262539.jpg" />增大
D.<img src="https://img.ppkao.com/2017-12/xieqiushi/2017120716370781231.jpg" />增大，<img src="https://img.ppkao.com/2017-12/xieqiushi/2017120716372262539.jpg" />减小
第8题
A、A.<img src="https://img.ppkao.com/2018-04/zhouyun/20180412175605391.jpg" />
B.<img src="https://img.ppkao.com/2018-04/zhouyun/2018041217562114745.jpg" />
C.<img src="https://img.ppkao.com/2018-04/zhouyun/2018041217562651092.jpg" />
D.<img src="https://img.ppkao.com/2018-04/zhouyun/2018041217562929580.jpg" />
E.<img src="https://img.ppkao.com/2018-04/zhouyun/2018041217563332745.jpg" />
第9题
A、A.<img src="https://img.ppkao.com/2018-08/chenfang/2018081516571386102.jpg" /><img src="https://img.ppkao.com/2018-08/chenfang/2018081516572558372.jpg" />
B.<img src="https://img.ppkao.com/2018-08/chenfang/2018081516572062708.jpg" />
C.<img src="https://img.ppkao.com/2018-08/chenfang/2018081516572915872.jpg" />
D.<img src="https://img.ppkao.com/2018-08/chenfang/2018081516573482159.jpg" />
第10题
A、A.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018080116564316705.jpg" />
B.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018080116564929545.jpg" />
C.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018080116565492959.jpg" />
D.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018080116570158166.jpg" />
E.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018080116570766172.jpg" />
F.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018080116571469081.jpg" />
