如果采用三项移动平均修匀时间数列，那么所得修匀数列比原数列首尾各少( )。[西安交大2007研]

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='30464' and id < 2461438 and id<>'2461438' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30464' and id > 2461438 and id<>'2461438' order by id asc limit 5