已知F为平行于xz平面的力,F =100 N,α=60°,AB = 20 cm,BC = 40 cm,CD = 15 cm,A、B、C、D处于同一水平面上。手摇曲柄上F对x、y、z轴之矩为多少。【图片】A. Mx(F)= -3031 N·cm,My(F)= -3464 N·cm Mz(F)= -1750 N·cmB. Mx(F)=-3031 N·cm,My(F)=-3464 N·cm Mz(F)=1750 N·cmC. Mx(F)=3031 N·mm,My(F)=3464 N·mm Mz(F)= -1750 N·mmD. Mx(F)= 3031 N·mm,My(F)=-3464 N·mm Mz(F)= 1750 N·mm