一般认为动机具有以下哪几种功能？（ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30547' and id < 2466324 and id<>'2466324' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30547' and id > 2466324 and id<>'2466324' order by id asc limit 5