对于工频而言，全波傅里叶算法数据窗口长度是(    )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69480' and id < 4501520 and id<>'4501520' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69480' and id > 4501520 and id<>'4501520' order by id asc limit 5