下列属于零序电流保护特点的是()

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69548' and id < 4507075 and id<>'4507075' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69548' and id > 4507075 and id<>'4507075' order by id asc limit 5