内压球形容器的应力为： A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/7a7e20156c8c4502840fc258ffe21c74.png"> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/6b137ba6e7464b2c8122eced2a3d45cd.png"> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/3c032f5116a04b288400df17925e39c2.png"> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/85ca21668f4045e2b864897bc3795fdf.png">

http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/75f92f05d558450f9e68e52200633e6b.png

http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/f6ebadff38ba4857862e848abba5ff8f.png

在圆柱壳轴对称弯曲问题的基本方程中，有三个方程式自动满足的，我们只需要求解三个平衡方程，它们是： A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/3c3eb06997f449be89a76e35f8073f1f.png"> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/7c87e3a7dc5445688a702fe5364a8635.png"> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/c6739033a3da46ce92e809ea34907621.png"> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/55a259aaa0b842c99f0d9c3b9176cae3.png">

是常微分方程。（ ）http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/564a3d9bd0ed4a268e246fb606dca8a5.png

若 =∞，则级数 收敛于 。（ ）http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/32fb85dd066a437a87922b798361205f.png

函数在点（0，0）处（ ）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/430c411bd86f4e9c8d257e2c00d9fbaa.png

若=∞，则级数收敛于。（ ）http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/32fb85dd066a437a87922b798361205f.png

若级数发散，则级数++…++…发散。（ ）http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/a95be4d04b8540a2a3d2a382ef950324.png

设区域，则的值为。( ）http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/468d5951e23a436ba9cd1954573d5aef.png