对于平均数类指标，确定样本大小的限制性指标是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25511' and id < 2147762 and id<>'2147762' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25511' and id > 2147762 and id<>'2147762' order by id asc limit 5