• 2022-07-27
    图 b 为图a 结构的力法基本体系,则力法方程中:[img=755x227]1802d8f3d92a50c.png[/img]
    A: [img=54x22]1802d8f3e225ffe.png[/img]; [img=54x22]1802d8f3eb78ca7.png[/img]
    B: [img=54x22]1802d8f3f442204.png[/img]; [img=54x22]1802d8f3eb78ca7.png[/img]
    C: [img=54x22]1802d8f3e225ffe.png[/img]; [img=54x22]1802d8f40ec5156.png[/img]
    D: [img=54x22]1802d8f3f442204.png[/img]; [img=54x22]1802d8f42150c2d.png[/img]