中国大学MOOC: 实腹式轴压杆绕x，y轴的长细比分别为http://edu-image.nosdn.127.net/CEDDCE7A3BB52B52DC56A37DE9DF8675.png?imageView&thumbnail=890x0&quality=100，http://edu-image.nosdn.127.net/2715192C2D5C066B84F9EEC130D1DD78.png?imageView&thumbnail=890x0&quality=100，对应的稳定系数分别为http://edu-image.nosdn.127.net/051E7EF77A20CC8EE7AE73090D7D0B9F.png?imageView&thumbnail=890x0&quality=100，http://edu-image.nosdn.127.net/CDC96ACA4577E26B3DE9DBF3AFBCEC46.png?imageView&thumbnail=890x0&quality=100，若http://edu-image.nosdn.127.net/991E5D4B35F3193105567CAF1B1CB1EC.png?imageView&thumbnail=890x0&quality=100，则( ) 。

中国大学MOOC: 下图中，若http://edu-image.nosdn.127.net/3CC508F9AB3640FC7B4FC8A56BCC3C4A.png?imageView&thumbnail=890x0&quality=100，http://edu-image.nosdn.127.net/1E98E4093ED9A9CF99D5410CB4F9E5FC.png?imageView&thumbnail=890x0&quality=1000011，求http://edu-image.nosdn.127.net/C431073D6B6C788B674E11D5E7EA9B8F.png?imageView&thumbnail=890x0&quality=100（ ）。http://edu-image.nosdn.127.net/3F2606B33B97941F5DFADC9F32BD58AD.png?imageView&thumbnail=890x0&quality=100

中国大学MOOC: 图示为（ ）建筑。http://edu-image.nosdn.127.net/35343C2CAC2D2E14042806D7F19774A9.png?imageView&thumbnail=890x0&quality=100

中国大学MOOC: 图示梁AB在所示荷载作用下的M图面积为http://edu-image.nosdn.127.net/6437338CAA255887D4940E325FBFAED0.JPG?imageView&thumbnail=890x0&quality=100。http://edu-image.nosdn.127.net/4F38A3760A4FA30E717EF9E0996A6797.JPG?imageView&thumbnail=890x0&quality=100

中国大学MOOC: http://edu-image.nosdn.127.net/F8D1C10653F1025CBF0BFC99472401F5.jpg?imageView&thumbnail=890x0&quality=100图示电路中i为