如下图所示,两梁中的弹性变形能分别为U11和U12,则两者的关系为()。
A. U12=3U11
B. U12=27U11
C. U12=9U11
D. U12=8U11
如下图所示桁架,在节点C处沿水平方向受力F作用。各杆的抗拉刚度相等,若结点C的铅垂位移以VL表示;BC杆的轴力以FN表示。则()。
A. FN≠0,VC≠00
B. FN=0,VC≠0
C. FN=0,VC=0
D. FN≠0,VC=0
The mid-18th century was predominated by a newly rising literary form--______, which gives
A. the traditional romance of aristocrats
B. the modern English novel
C. the modern English drama
D. the traditional English poem