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【多选题】
本实验中,制备碘酸铜饱和溶液的必要操作是( )。
A.
过滤前必须充分搅拌，过滤体系为固液共存体系
B.
碘酸铜固液混合物过滤前必须冷却至室温
C.
用干的双层滤纸过滤
D.
滤液搜集于干燥烧杯中
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B.
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