UPS电源系统的大量维护、检修工作主要集中在（ ）部分。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='29463' and id < 2399354 and id<>'2399354' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29463' and id > 2399354 and id<>'2399354' order by id asc limit 5