• 2022-10-30
    图示平板平面([tex=1.786x1.143]XK2jofGsmW+kCC5i5JZVgw==[/tex]面)内作用着任意平面力系,要使平板保持平衡应满足的平衡方程是(      )。[img=387x419]179a91285f381cd.png[/img]
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  • 举一反三