下列各组变化中,每一转化在一定条件下均能一步实现的是 A.②和

下列各组变化中,每一转化在一定条件下均能一步实现的是

 A.②和③           B.①和②          C.①和③        D.①②③

 

答案

B

解析:略

 

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