• 2022-07-24
    半径为[img=14x19]1802f66212d35d7.png[/img]的半球形水池装满水(水的密度为1),现将水全部吸完,需要做功 = ( )
    A: [img=159x52]1802f6621e22dbc.png[/img]
    B: [img=139x52]1802f66227cf8a7.png[/img]
    C: [img=92x52]1802f662309f98d.png[/img]
    D: [img=92x52]1802f6623928022.png[/img]