[A] addition [B] brief [C] general [D] fact
[A] addition
[B] brief
[C] general
[D] fact
[A] addition
[B] brief
[C] general
[D] fact
A、åmO(F) = - m - XA×L×sinj + YA×L×cosj - Q×2L×cosj - P× L×sinj + NB×3L×cosj = 0
B、åmO(F) = - m - Q×2L×cosj - P× L×sinj + NB×3L×cosj = 0
C、åmB(F) = - m - XA×2L×sinj - YA×2L×cosj + Q×L×cosj = 0
D、åmB(F) = - m - XO× L×sinj - YO×3L×cosj+ Q×L×cosj = 0
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