SQL Error: select id,body,options from ***_enewstiku where sourceid='32609' and id < 2592987 and id<>'2592987' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32609' and id > 2592987 and id<>'2592987' order by id asc limit 5
与采样信号中所含最高频率成分的频率
应满足（）。
＞2
＜2
＞
=