本文基于价值工程原理，研究了价值工程与采购招标的关系。
Based on value engineering theory, this paper studies the relationship between value engineering and procurement bidding.
本文主要研究了虚拟企业和供应链管理的运作原理和技术，提出了虚拟企业供应链管理运行的生产计划、采购、库存和销售管理模式。
The working principle and technology of virtual enterprise and supply chain management are studied. Product planning, purchase, inventory and sales management in virtual enterprise are put forward.
第三章介绍了网络协同采购系统的设计，描述了该系统的工作原理和实现流程，并介绍了对系统部分模块的建模和实现。
Chapter 3, the design of network 'collaborative purchase system is analyzed, work principle and realization flow are described and modeling and realization of some modules in system are introduced.
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