economic ill经济病症economicadj.经济学的；经济的；有利可图的economic laws and regulations经济法规economic hundred call seconds经济百秒呼叫economic structure alteration经济结构变动Economic Inventory Procedures经济库存步骤economic order quantity model经济订货批量模型economic and cultural regions经济文化区economic structural adjusting经济结构调整economic development in China中国经济economic elementary knowledge经济基础知识economic spectrum utilization频谱有效利用