距离保护是以距离（   ）元件作为基础构成的保护装置。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69393' and id < 4491996 and id<>'4491996' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69393' and id > 4491996 and id<>'4491996' order by id asc limit 5