A pigment dispersant for water borne system was prepared by free radical polymerization and stable free radical polymerization.
采用自由基聚合和稳定自由基聚合，可合成水性体系用的颜料分散剂。
Chlorine was first added to a community water system in 1908 in Chicago and was instrumental in eliminating many types of water-borne disease such as Cholera and Typhoid fever.
1908年，芝加哥的公共用水系统首次加入氯，为的是要消除饮用水引起的多种疾病，如霍乱、伤寒等。
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