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2012年3月22日是第二十届“世界”。 (1)节约用水、防止水污染应成为我们的自觉行为。下列有关叙述中不正确的是 。 A．城市生活污水、工业废水应遵循“先净化，后排放”的原则 B．农业生产中改变灌溉方式，变漫灌为喷灌或滴灌 C．自来水厂的收费项目中包括自来水水费和水资源费等 D．禁止使用农药、化肥，防止水体污染 (2)自制家用净水器中的小卵石起 作用。 (3)硬水给生活和生产带来很多麻烦，生活中常用_____方法来降低水的硬度。 (4)如图所示是水的电解实验装置， 其中正极与负极产生的气体体积之比为 ，经检验，试管1中收集的气体是 __ ，水通电分解实验中的最小粒子是 和 。
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