设函数在点处存在关于和的一阶偏导数，则极限的值为.https://img-ph-mirror.nosdn.127.net/AzSolBHpAcwrMwJeuCZ3qw==/6608821346933715540.pnghttps://img-ph-mirror.nosdn.127.net/riflWFLWLx67TbwPlzd9tA==/6608437617375621610.pnghttps://img-ph-mirror.nosdn.127.net/dyIPWyFt4Slg58f2hJhSgA==/6599324865005947430.pnghttps://img-ph-mirror.nosdn.127.net/UdiS2LasHHPU1rvP0W8m0g==/6599309471843212852.pnghttps://img-ph-mirror.nosdn.127.net/9E39I3VJ73DxsgLGL8JhGg==/6608841138143042768.png
举一反三
- 设函数在有界闭区域上连续，则是的https://img-ph-mirror.nosdn.127.net/AzSolBHpAcwrMwJeuCZ3qw==/6608821346933715540.pnghttps://img-ph-mirror.nosdn.127.net/7fwte4zRVRFsQA6AJGLNzQ==/6599274287471067843.pnghttps://img-ph-mirror.nosdn.127.net/JP8UrBsuml645rOhx1gFcw==/6608897213236161833.pnghttps://img-ph-mirror.nosdn.127.net/O_G3pHt3KyUzaRcmaobAmg==/6608234207725603267.png
- 设是由圆周所围成的闭区域位于直线上方的部分，函数在上连续，则 ．https://img-ph-mirror.nosdn.127.net/7fwte4zRVRFsQA6AJGLNzQ==/6599274287471067843.pnghttps://img-ph-mirror.nosdn.127.net/SCWFbeCHt7KazxtYt1iHrw==/6608537672933918176.pnghttps://img-ph-mirror.nosdn.127.net/Bl8J31m4wDZC158XOpbd8A==/3773172062906460416.pnghttps://img-ph-mirror.nosdn.127.net/AzSolBHpAcwrMwJeuCZ3qw==/6608821346933715540.pnghttps://img-ph-mirror.nosdn.127.net/7fwte4zRVRFsQA6AJGLNzQ==/6599274287471067843.pnghttps://img-ph-mirror.nosdn.127.net/Ifzli-MewWUJphrm6hvdDA==/6608201222376771979.png
- 图所示机构的自由度是（ ）。[img=197x160]18034e492717e18.jpg[/img] A: n=8, PL=11, Ph=1, F=1 B: n=8, PL=10, Ph=2, F=2 C: n=9, PL=12, Ph=2, F=1 D: n=9, PL=13, Ph=0， F=1
- 图所示机构的自由度是（ ）。[img=374x158]18034e4940516e4.png[/img] A: n=7, PL=9, Ph=1, F=2 B: n=8, PL=10, Ph=1, F=3 C: n=8, PL=11, Ph=1, F=1 D: n=7, PL=10, Ph=0， F=1
- 图所示机构的自由度是（ ）。[img=225x225]18034e49029b42b.jpg[/img] A: n=7, PL=10, Ph=0, F=1 B: n=9, PL=12, Ph=2, F=1 C: n=8, PL=11, Ph=1, F=1 D: n=8, PL=11, Ph=0, F=2