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在日常生活或化学实验中,①浓硫酸、②小苏打(NaHCO 3 )、③碘酸钾(KIO 3 )、④乙醇(C 2 H 5 OH)等物质都有着重要的用途,选择上述物质的编号填入相应空格: (1)常用于实验室作干燥剂的是______; (2)可用于制发酵粉的是______; (3)用于配制医用消毒酒精的是______;(4)为防治碘缺乏病,可在食盐中加入______.
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