问题力F对O点之矩，记作（)。A.Mo（F)=FdB.Mo（F)一±FC.Mo（F)一-FdsinaD.M0（F)一±FdCOSa

力F对O点之矩，记作()。A.Mo(F)=FdB.Mo(F)一±FC.Mo(F)一-FdsinaD.M0(F)一±FdCOSa请帮忙给出正确答案和分析，谢谢！