• 2022-06-09
    求图示三根绳子AB、AC、AD的拉力。[img=712x511]1802f400a538cc1.png[/img]
    A: FAC=900N, FAD=464N, FAB=693N
    B: FAC=646N, FAD=900N, FAB=693N
    C: FAC=646N, FAD=693N, FAB=900N
    D: FAC=693N, FAD=900N, FAB=464N