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一、概述近年来，做为计算机在工艺设计中的应用，计算机辅助工艺设计系统的研究开发得到了迅猛发展，各种CAPP系统纷纷涌现，但不论何种形式，它们都有这样一个重要的组成部分——零件信息描述。对于零件信息描述，可以分成以下两大类：1．人机交互式：主要有（1）GT编码法，?
I. Overview In recent years, as the application of computer technology in process design, research and development of computer-aided process design system has been rapidly developed, various CAPP systems have emerged, but no matter what form they have such an important composition Section - Description of part information. For parts information description, can be divided into the following two categories: 1. Human-computer interaction: There are (1) GT coding method,?