The emphasis of the research in thesis lies in identifying the categories of the structures for manufacture and correcting dimensions . and the method adopted is called " character recognition " . using this method , the computer first recognizes the structures in the shaft - like part drawings according to their characteristics , such as slots , through holes and so on , and then corrects the drawings based on the recognition 本文的研究重点为轴类零件图中各种工艺结构的识别和尺寸标注的批改，采用的方法为“特征识别法” ，该方法针对轴类零件图中各种工艺结构的固有特征，从一幅零件图中识别出零件的各种工艺结构，包括槽、通孔等，然后在此基础上进行批改。
Slcad easily adapts to the wide range of technologies used for line surveys such as total station instruments . it accepts survey data in both the plan and the profile coordinate systems . survey data can be keyed in , or can be electronically imported from a survey data file . slcad has a customizable data import routine that can read a wide range of survey data formats 控制尺寸调整了，修改一下前面输入的控制尺寸的数据，后续生成的杆件和图形自动就随之变化，包括尺寸标注都自动随之移动节点板设计改变了，相关的其余的杆件会自动调整并且材料表会自动修改！
Intelligentization and automation of dimensioning is an important part of cad / capp / cam , but due to the multiplicity of entity and flexibility of allocating dimensions , the problem of constraint dimensions has not been solved perfectly . constraint dimensions can give a numerical standard for testing completeness of 2d engineer graphics dimensioning 尺寸标注的智能化和自动化一直是cad capp cam领域研究的重要课题，但由于形体表达的多样性和尺寸标注的灵活性，形体的尺寸约束解的获得一直都未得到很好的解决。
