• 2022-05-30
    如图所示,在边长为a的正六面体的棱边CD上,作用着与其重合的力F,则力F对x、y、z轴的矩为[img=351x334]17de8f8200fff66.png[/img]
    A: Mx(F)= -Fa, My(F)=Fa, Mz(F)=0
    B: Mx(F)=0 My(F)=0 Mz(F)=Fa
    C: Mx(F)=Fa My(F)= -Fa Mz(F)=0
    D: Mx(F)=0 My(F)=0 Mz(F)=0