根据存货的经济订货基本模型，影响经济订货批量的因素是（　　）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69448' and id < 4497473 and id<>'4497473' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69448' and id > 4497473 and id<>'4497473' order by id asc limit 5