设非正弦周期函数f（t）的周期为，则其直流分量（）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32677' and id < 2599465 and id<>'2599465' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32677' and id > 2599465 and id<>'2599465' order by id asc limit 5