继电保护的任务是系统发生故障时仅发出信号。（  ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69481' and id < 4500240 and id<>'4500240' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69481' and id > 4500240 and id<>'4500240' order by id asc limit 5