当样品量为3时，取样量应为

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30294' and id < 2449502 and id<>'2449502' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30294' and id > 2449502 and id<>'2449502' order by id asc limit 5