从减少系统振荡的影响出发，距离保护的测量元件应采用（    ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69517' and id < 4503668 and id<>'4503668' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69517' and id > 4503668 and id<>'4503668' order by id asc limit 5