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【单选题】
某平面任意向O点简化，得到如图所示的一个力 和一个力偶矩为Mo的力偶，则该的最后合成结果为（）
A.
作用在O点的一个合力；
B.
合力偶；
C.
作用在O点左边某点的一个合力；
D.
作用在O点右边某点的一个合力。
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