若 =∞，则级数 收敛于 。（ ）http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/32fb85dd066a437a87922b798361205f.png
举一反三
- 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
- 若级数http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/8905974d3ec04f3285b62c18114467c3.png收敛，则http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/221e7836b56b4f99b50bc3016b80400d.png收敛。（ ）<br>
- 若级数http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/e3aed89d4b864614815b126628d94b34.png收敛，则http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/e2642043e7144a61a807e2a050ccd6a9.png也收敛。( )<br>
- 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">