按照社会功能，事业单位可划分为以下哪些类别？（ )

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31290' and id < 2511471 and id<>'2511471' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31290' and id > 2511471 and id<>'2511471' order by id asc limit 5