零序电流保护能反应各种不对称故障，但不反应三相对称故障。()

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69548' and id < 4507119 and id<>'4507119' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69548' and id > 4507119 and id<>'4507119' order by id asc limit 5