若已知本期值为a，本期预测值为b,并且a >b。则用指数平滑法预测下期值F时 有（）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30464' and id < 2461445 and id<>'2461445' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30464' and id > 2461445 and id<>'2461445' order by id asc limit 5