• 2022-06-03
    一力F作用在平面OABC上(如图所示),于是力F对OX、OY、OZ三轴之矩应为()。
    A: mx(F)=0,my(F)=0,mz(F)=0
    B: mx(F)=0,my(F)=0,mz(F)≠0
    C: mx(F)≠0,my(F)≠0,mz(F)=0
    D: mx(F)≠0,my(F)≠0,mz(F)≠0