高频阻波器的作用是将高频信号限制在被保护的输电线路以内，而不致穿越到相邻线路上去。（   ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69378' and id < 4491533 and id<>'4491533' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69378' and id > 4491533 and id<>'4491533' order by id asc limit 5