• 2022-05-31
    已知平面区域 [img=204x40]18031b8bddbff1b.png[/img], 记 [img=697x48]18031b8be969df7.png[/img]则
    A: [img=91x22]18031b8bf2131b7.png[/img]
    B: [img=91x22]18031b8bfa79c1a.png[/img]
    C: [img=91x22]18031b8c0390201.png[/img]
    D: [img=91x22]18031b8c0c51352.png[/img]