This proof following enterprise already through the authentication , and has set up a file in the dongguan 114 nets industry and commerce enterprise database , inquires the more detailed enterprise material , please dial the dongguan enterprise information desk 96060 ( artificially ) 9686810114 billion ( to be automatic ) , this enterprise numbers for 45324 兹证明东莞市贸易经济发展总公司已通过认证，并已在东莞114网工商企业数据库中备案，查询更详细的企业资料，请拨东莞企业查询台96060 （人工） 9686810114 （自动） ，该企业编号为45324 。
First , according to the theoretical discussion about processing trade ( pt ) and " the beginning of pt ' s going westward " in china ， this paper tries to disclose the pt ' s global evolutional rule from product life cycle model and technological gap model 。 as well as , this paper tries to construct a theoretical platform to study pt properly in china by absorbing the mainstream view of pt ' s economic essence in theoretical field 针对理论界关于我国加工贸易问题的争论和我国加工贸易“西进运动”的开端，本文尝试性地从产品的寿命周期理论和技术差距理论探讨了加工贸易全球性产业与区域格局演化规律，并吸收了理论界关于加工贸易经济实质争议的主流观点，构建了支撑我国加工贸易发展的理论平台。
