• 2022-06-19
    18030c4c64e87d3.png, 则二重积分[img=69x48]18030c4c6e1f531.png[/img]等于
    A: [img=9x43]18030c4c7743beb.png[/img]
    B: [img=9x43]18030c4c8010017.png[/img]
    C: 1
    D: [img=9x43]18030c4c880093f.png[/img]
    E: [img=9x43]18030c4c9010538.png[/img]
    F: 0