在电力系统中备用容量按用途分(    )。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69507' and id < 4502824 and id<>'4502824' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69507' and id > 4502824 and id<>'4502824' order by id asc limit 5