实验开始前应该做好哪些准备？（ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30401' and id < 2457703 and id<>'2457703' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30401' and id > 2457703 and id<>'2457703' order by id asc limit 5