如图4,已知四边形ABCD是平行四边形,下列结论中不正确的是(  

如图4,已知四边形ABCD是平行四边形,下列结论中不正确的是(  

A、当AB=BC时,它是菱形      B、当ACBD时,它是菱形

C、当∠ABC=900时,它是矩形   D、当AC=BD时,它是正方形

 


答案

D

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