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A. KCl B. Fe2(SO4)3

C. KAl(SO4)2 D. FeCl3

【答案】A

【解析】Fe2(SO4)3、FeCl3可產(chǎn)生Fe(OH)3膠體,能用于凈水,KAl(SO4)2溶液可產(chǎn)生Al(OH)3膠體,也可用于凈水。

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