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如图,四边形ABCD是平行四边形,AC、BD相交于点O,不添加任何字母和辅助线,...
如图,四边形ABCD是平行四边形,AC、BD相交于点O,不添加任何字母和辅助线,要使四边形ABCD是菱形,则还需添加一个条件是
(只需填写一个条件即可).
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