在平行六面体ABCD-A1B1C1D1中,M为AC与BD的交点,若, ,,则下列向量中

在平行六面体ABCD-A1B1C1D1中,M为AC与BD的交点,若, ,则下列向量中与相等的向量是  (    )   

   A.                     B.   

 C.                     D.

答案

A

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