生物化学中将具有一个碳原子的集团称为一碳单位，生物体内常见的一碳单位不包 )0

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30921' and id < 2488447 and id<>'2488447' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30921' and id > 2488447 and id<>'2488447' order by id asc limit 5