设积分 , 交换积分次序后, 积分为 。( ）http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/864b8fd140404405a3f0c50977552895.png
举一反三
- 设http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/1bd7547996a1490b95321fae3647dfb1.png是连续函数，交换二次积分的次序：http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/1b9e962296664676bdc8fb3603776fbe.png（ ）<br>
- 设http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/d6dde9bc7b6c4305bb6bece9138ceb03.png是连续函数，则二次积分http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/c6646b6be98f410a869ece0ba01c0ba1.png（ ）<br>
- 设积分区域D由http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/0c9ae1ed54164a58bd49dd327b8b9613.png和http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/106bacc400de4a258c3c2cc1e88f5e50.png围成，则http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/533bf3bfe8d7439fbe2689a974be1cf1.png（ ）<br>
- 二次积分http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/4fdc2143d4064c3db3371cea1b083d20.png（ ）
- 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">