下列各组物质中,前者为强电解质,后者为弱电解质的是(     

下列各组物质中,前者为强电解质,后者为弱电解质的是(      )
A.硫酸,硫酸镁
   B.碳酸,碳酸钠   C.食盐,酒精       D.碳酸氢钠,醋酸

答案

D

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