发布日期:2010-06-24 05:22:22
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水是一种重要的物质,在实验室和日常生活中有着十分重要的作用。 (1)请列举出水在实验室中的一个用途 (2)硬水会给生产和生活带来许多不便,生活中可用 的方法降低它的硬度 (3)农业和园林浇灌植物时,将大水漫灌改为喷灌、滴灌的目的是 (4)下列各项与自来水的净化过程无关的是 (填标号); A.吸附 B.消毒 C.电解 D.过滤 |