如图，已知四边形 ABCD 是平行四边形，则下列结论中正确的是．_刷题宝

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如图，已知四边形 ABCD 是平行四边形，则下列结论中正确的是（）．

A：当 $A B ⊥ B D$ 时，它是矩形

B：当 $A C = B D$ 时，它是正方形

C：当 $∠ A B C = 90^{\circ}$ 时，它是菱形

D：当 $A B = B C$ 时，它是菱形

上一题下一题 0.0难度选择题更新时间:2015-05-13 05:39:03

答案(点此获取答案解析）

D

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