• 2022-06-29
    图示截面对x,y轴的惯性积是:[img=578x479]1802f41b3c15bb7.png[/img]
    A: [img=127x30]1802f41b44a5c0d.png[/img]
    B: [img=142x42]1802f41b4cdc4dc.png[/img]
    C: [img=133x32]1802f41b566b8b8.png[/img]
    D: [img=107x48]1802f41b5ecd45e.png[/img]