• 2022-06-29
    已知曲面 [img=118x26]18031b9c1481410.png[/img] 上点[img=12x19]18031b9c1dee521.png[/img]处的切平面平行于平面 [img=151x22]18031b9c269e8e5.png[/img] 则点 [img=12x19]18031b9c1dee521.png[/img]的坐标为[img=30x25]18031b9c382c62c.png[/img]
    A: [img=69x25]18031b9c4082bc2.png[/img]
    B: [img=69x25]18031b9c48a8c2b.png[/img]
    C: [img=55x25]18031b9c508399b.png[/img]
    D: [img=83x25]18031b9c583fe28.png[/img]