• 2022-06-15
    图中力在x,y,z轴上的投影为[img=434x336]180356612ea2bc8.jpg[/img]
    A: [img=366x33]18035661399ad85.jpg[/img]
    B: [img=404x32]18035661441ec93.jpg[/img]
    C: [img=390x35]180356614e6c1a2.jpg[/img]
    D: [img=409x29]1803566158a4253.jpg[/img]
  • 举一反三