若http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/5c06779096154f7c8b702d66edce8df1.png在点http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/7d26b1d151c9438485fa20b9ca38af20.png处可微，则偏导数http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/518027493bf540a1a080f49503d0afb3.png一定连续。
举一反三
- 若http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/58b41e7063be4bf5a0cae88cf3f74248.png在点http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/2ae9760be5dd4e36afe78475f06dfeed.png处可微，则偏导数http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/13ff091b7e4d457cbbe0302be816ba67.png一定存在。<span style="font-family: 宋体;</span><br><br>
- 若偏导数http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/a1b21fe4866c4a31bc3d618a2ea3c815.png存在，则http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/7cb9e1dd6acf40e6abfc4d2b731eeef2.png在点http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/e1a9c8e68bfc4a8f949807cf6c5f0a12.png处连续。<span style="font-family: 宋体;</span><br><br>
- 设http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/5f9f81d9a1184c2eb383cb81ebbe2768.png，若http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/410a0d9f8b4a4f82a6818a45f4a3b450.png，http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/637f75734cb849caa773da5377f55f5e.png，http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/29aefd40f6c54e788587a2115dd02467.png，则http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/631634fcf7854ec88eedede14de7c1de.png之间的大小顺序为（ ）<br>
- 求函数http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/c7a245151812467d85af7a1cf91a4be0.png在点http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/917120f5d9354f20ad871d7acfc759d1.png处全微分，则http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/63eafd5e56d84117ba59026b91c8059e.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>