中国大学MOOC: 两匀质球形天体A、B，http://img2.ph.126.net/J5RdMg4uxbPI-OCISYooLw==/1962443537726885126.png，http://img2.ph.126.net/-QWHIzqMBdjOMNOVYNsiOQ==/6597821832612007808.png。若两个天体上的逃逸速度分别为http://img0.ph.126.net/yKXuY9XDJKgPbLo80QIt3A==/6630648851771615496.png和http://img0.ph.126.net/6uTl365u1BPXOezMELzUrw==/976999644181065801.png；则：
举一反三
- 中国大学MOOC:两匀质球形天体A、B，http://img2.ph.126.net/J5RdMg4uxbPI-OCISYooLw==/1962443537726885126.png，http://img2.ph.126.net/-QWHIzqMBdjOMNOVYNsiOQ==/6597821832612007808.png。若两个天体上的逃逸速度分别为http://img0.ph.126.net/yKXuY9XDJKgPbLo80QIt3A==/6630648851771615496.png和http://img0.ph.126.net/6uTl365u1BPXOezMELzUrw==/976999644181065801.png；则：
- <img src="http://img1.ph.126.net/JMg9tqo6gf8sEot0y9NSUg==/6619559177490984445.gif" />? 0|<img src="http://img1.ph.126.net/uSXYTJKY1--cmM46BmL7Pg==/1177972777551495010.gif" />|<img src="http://img0.ph.126.net/-vDBDVZEQJqbFun7PrX7vg==/2887370311115280318.gif" />|<img src="http://img2.ph.126.net/NK1mnxUZa_ibCGqQvHOaoQ==/2435884448470832003.gif" />
- <img src="http://img1.ph.126.net/xRWXQUfZJwmSXkQiZ0l2HQ==/3826089358528721080.jpg" />? <img src="http://img2.ph.126.net/QX-jBzzFTrwpTjQkcBtfcg==/2449958197307439176.jpg" />|<img src="http://img0.ph.126.net/3XApesgU0Iga8L5Tkm0YXg==/6630324495838409649.jpg" />|<img src="http://img2.ph.126.net/sPsiWYSStdIbrCUcsMBK9A==/3114802092298176869.jpg" />|<img src="http://img1.ph.126.net/y-FdOVmaocQvOIOXtXTxEw==/662592095194801258.jpg" />
- 设总体X～N(μ,σ^2),μ和σ是未知参数。为估计参数σ^2的置信区间，应选T=____________作为枢轴变量,并且T服从______。? <img src="http://img2.ph.126.net/SHUrsWncVzw3TbqMT630Ug==/6632510324955921443.png" /><br />|<img src="http://img2.ph.126.net/I5VmIURcDfhDZIPIQy5JZw==/6632334403095483329.png" />|<img src="http://img0.ph.126.net/v1kDLV9rE4i9IWRPugufXQ==/6632404771839652521.png" />|<img src="http://img0.ph.126.net/sQOy3VhGtuk-bcM7dsC3kQ==/6632272830444326010.png" />
- 中国大学MOOC:三角形水坝，若已知http://img2.ph.126.net/teebOowK_yKYI2_lTBKG0A==/6632643365861992142.png,http://img0.ph.126.net/kvOPlIJhvt7V-APC2iG4_w==/6632395975748344275.png,http://img0.ph.126.net/X_tzegAQCW8R1Bgc8sF8TA==/6632634569768968473.png.