单元刚度矩阵反映了该单元杆端位移与杆端力之间的关系,均具有对称性。
参考答案:对
It is not our mistakes that define who we are; it is how we from those mistakes that counts.
A.differ
B.suffer
C.prevent
D.recover
若p+q=0,抛物线y=x2+px+q必过点( )
A.(-1,1)
B.(1,-1)
C.(-1,-1)
D.(1,1 )