无备用电源接线的主要优点、缺点是(    )

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69456' and id < 4498080 and id<>'4498080' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69456' and id > 4498080 and id<>'4498080' order by id asc limit 5