设平面上有四个互异的点A、B、C、D,已知()・()=0,则△ABC的形状是 

设平面上有四个互异的点ABCD,已知()・()=0,则△ABC的形状是  

A.直角三角形          B.等腰三角形           C.等腰直角三角形  D.等边三角形

答案

B

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