旁路母线的作用是保证主母线检修时不停电。（  ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69483' and id < 4500511 and id<>'4500511' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69483' and id > 4500511 and id<>'4500511' order by id asc limit 5