线路的功率谱密度中低频分量是由下列哪些因素决定的_

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30263' and id < 2448206 and id<>'2448206' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30263' and id > 2448206 and id<>'2448206' order by id asc limit 5