用来测量细菌大小的单位是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29864' and id < 2422600 and id<>'2422600' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29864' and id > 2422600 and id<>'2422600' order by id asc limit 5