下列性质可以证明化合物内一定存在离子键的是  (    ) A.可溶

下列性质可以证明化合物内一定存在离子键的是     

A.可溶于水     B.具有较高的熔点   C.水溶液能导电   D.熔融状态能导电

答案

D

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