• 2022-07-26
    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]1803c1f0caf4a5b.png[/img]等于
    A: [img=18x43]1803c1f0d323d79.png[/img]
    B: 7
    C: -7
    D: [img=34x43]1803c1f0daf4cbd.png[/img]
    E: [img=34x43]1803c1f0e2ee026.png[/img]
    F: [img=18x43]1803c1f0eb47dde.png[/img]
    G: 6
    H: -6