隐血实验前三天，需禁食（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30938' and id < 2490298 and id<>'2490298' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30938' and id > 2490298 and id<>'2490298' order by id asc limit 5