下列（    ）属于继电保护的测量比较元件。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69481' and id < 4500211 and id<>'4500211' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69481' and id > 4500211 and id<>'4500211' order by id asc limit 5