• 2022-06-19
    图示结构中,已知各杆EI=常数,则A截面弯矩(内侧受拉为正)为:[img=186x125]1803b44812417cd.jpg[/img]
    A: 0
    B: [img=53x27]1803b44819fe6f5.png[/img]
    C: [img=53x27]1803b44822189d5.png[/img]
    D: [img=71x27]1803b44829d3751.png[/img]