单母线分段接线与单母线接线相比较，其优点是（  ）。 

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69483' and id < 4500480 and id<>'4500480' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69483' and id > 4500480 and id<>'4500480' order by id asc limit 5