在抽样时，为了能使样本更具有代表性,样本容量越大越好。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30773' and id < 2477767 and id<>'2477767' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30773' and id > 2477767 and id<>'2477767' order by id asc limit 5