个案研究适于做下列（）研究。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25792' and id < 2166344 and id<>'2166344' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25792' and id > 2166344 and id<>'2166344' order by id asc limit 5