Y2+2□====4XY中方框里应填写的化学式为(    )A.X2Y2            

Y2+2□====4XY中方框里应填写的化学式为(    )

A.X2Y2                 B.X2Y           C.X3Y4                   D.XY2

 

答案

B

解析:略

 

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