△ABC的三内角A、B、C所对边的长分别为a、b、c.设向量p=(a+c,b

ABC的三内角ABC所对边的长分别为abc.设向量p=(acb),q=(baca).若pq,则角C的大小为                                                                                                  (  )

       A  B               C          D

答案

B

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