• 2022-06-18
    曲面[img=122x21]17e0b34c61602b3.jpg[/img]在点[img=58x19]17e0b34c6c02a3d.jpg[/img]的法线方程为( )
    未知类型:{'options': ['', ' [img=147x35]17e0b34c803e278.jpg[/img]', ' [img=147x35]17e0b34c8a33269.jpg[/img]', ' [img=147x35]17e0b34c9415e42.jpg[/img]'], 'type': 102}