• 2022-11-04
    设L是从A(0,1,1)到B(2,3,3)的直线段,则第二类曲线积分[img=204x48]18038578bfb8833.png[/img]等于
    未知类型:{'options': ['', '7', '-7', '', '', '', '6', '-6'], 'type': 102}