继电保护按照作用可以分为(    )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69493' and id < 4501525 and id<>'4501525' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69493' and id > 4501525 and id<>'4501525' order by id asc limit 5