纳米是一个长度单位，1纳米等于（ ）

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='27099' and id < 2247079 and id<>'2247079' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27099' and id > 2247079 and id<>'2247079' order by id asc limit 5