X.Y.Z三元素的化合价为+1.+4.-2,组成的化合物的化学式可能是---

XYZ三元素的化合价为+1+4-2,组成的化合物的化学式可能是------        

  A.XYZ4      B.X4YZ3         C.X2YZ3          D.X3YZ2

答案

 C

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