对于单母线变电站，可能采取的保护方式有（  ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69493' and id < 4501563 and id<>'4501563' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69493' and id > 4501563 and id<>'4501563' order by id asc limit 5