挑战习题
1/5单选题
难度:

1.下列命题中.①中心对称图形一定是轴对称图形;②有两条互相垂直的对称轴的轴对称图形一定是中心对称图形;③关于某一点为中心对称的两个三角形全等;④两个重合的图形一定为中心对称.其中正确的个数为(    )
A 1个
B 2个
C 3个
D 4个
提示1:
5YiG5Yir5qC55o2u5Lit5a+556ew5Zu+5b2i5Lul5Y+K5Lit5b+D5a+556ew5ZKM6L205a+556ew5Zu+5b2i55qE5oCn6LSo6L+b6KGM5Yik5pat5b6X5Ye65Y2z5Y+v77yO
正确答案:Qg==
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