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“如果二角对顶,那么二角相等”可变换为等值于它的命题是()

A、如果二角不对顶,那么二角不相等
B、只有二角相等,二角才对顶
C、如果二角不相等,那么二角对顶
D、只有二角对顶,二角才相等
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正确答案:

B

答案解析:

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