http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/75f92f05d558450f9e68e52200633e6b.png
举一反三
- 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/f6ebadff38ba4857862e848abba5ff8f.png
- 设z=f(x,v) ，v=v(x,y) ，其中f,v具有一阶连续偏导数，则（ ）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/64ca8940dd6e4835901f2da3b85b7607.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">
- 已知f(t)↔F(w)，则下列说法正确的是（） A: tf(t)↔wF(w) B: F(t)↔f(w) C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/e987a05c70d3455bad2fbdef6ce1fc1d.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/92f68075a5ff43708660199e4eed9415.png" />