4.1 机电产品的关键特征 产品关键特征（PKCs，Product Key Characteristics）是 一个使能器（enabler），能够将离散、互不联系的知识结合 起来。
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特征造型技术是新一代CAD系统的关键技术，是产品模型技术的核心。
Feature modeling is the key technique in the new CAD system, it is the core technique of product model.
低成本、高质量、定制化的产品和服务是定制生产模式的关键特征和核心竞争力。
The customization products and service with low cost, high equality are the key features and the core competence of the mass customization pattern.
本文着重研究虚拟原型技术中的两个关键问题：产品概念设计建模、虚拟特征生成及其主要实现技术。
This paper addresses the following techniques: product modeling in conceptual design, virtual feature generation, and some important implementation techniques of them.
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