掌握同类事物的共同的关键特征和本质属性的学习称为（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27590' and id < 2273580 and id<>'2273580' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27590' and id > 2273580 and id<>'2273580' order by id asc limit 5