下列有关水的叙述中,不正确的是 (       ) A.用明矾溶液可

下列有关水的叙述中不正确的是 (      

A.用明矾溶液可以区分硬水和软水                   B.水是由水分子构成的一种氧化物

C.水汽化时分子间隔发生了变化               D.水是能溶解多种物质的常用溶剂

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