下面所列各种电力网接线方式中，属于有备用接线方式的是(   )

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68479' and id < 4421671 and id<>'4421671' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68479' and id > 4421671 and id<>'4421671' order by id asc limit 5