教科书中的练习题多属于（ ）的问题。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30645' and id < 2471207 and id<>'2471207' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30645' and id > 2471207 and id<>'2471207' order by id asc limit 5