高频保护的适用范围为（   ）,是一种无时限快速原理保护。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69518' and id < 4503737 and id<>'4503737' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69518' and id > 4503737 and id<>'4503737' order by id asc limit 5