【单选题】Is there any change in the schedual of the group?
【单选题】如图所示桁架,各杆 EA 为常数,除支座链杆外,零杆数为( )。
【单选题】如图所示桁架,在结点C沿水平方向受P力作用。各杆的抗拉刚度相等。若结点C的铅垂位移以VC表示,BC杆的轴力以NBC表示,则( )。
【单选题】Is there any change in Louisa and Will’s relationship?
A.
Their relationship has become a little better
B.
Their relationship has become worse
【简答题】平面桁架由7根截面相同的均质杆组成,杆长如图所示.如各杆单位长度的质量均相等,求桁架质心的坐标.
【简答题】Is there any change in the British dinner?
【单选题】如图a)所示桁架各杆EA均为有限值。当撤去杆.AB采用图b)为力法基本体系时,相应力法方程的右端项应()
【判断题】如图所示桁架,若杆AB的截面尺寸改变,则桁架各杆的内力也将随着改变。( )