高分子溶液在放置过程中会自发地聚集而沉 淀，这种现象称为（  ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24955' and id < 2126929 and id<>'2126929' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24955' and id > 2126929 and id<>'2126929' order by id asc limit 5