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(2012•金山区二模)在下列命题中,是真命题的是( ) A.两条对角线相等的四...
(2012•金山区二模)在下列命题中,是真命题的是( )
A.两条对角线相等的四边形是矩形
B.两条对角线互相垂直的四边形是菱形
C.两条对角线互相平分的四边形是平行四边形
D.两条对角线互相垂直且相等的四边形是正方形
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