形容细菌大小常用长度单位是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31196' and id < 2504867 and id<>'2504867' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31196' and id > 2504867 and id<>'2504867' order by id asc limit 5