1·The tolerancing process and its characteristics were studied based on the product conceptual structure design automation technology. A four layer product tolerance model was put forward.
在产品概念结构设计自动化技术基础上，研究了产品公差设计过程及其特点，提出了四层产品公差结构模型。
2·As guiding principles, the tolerancing principles deal with the relationship between form-position tolerance and size tolerance in precision design.
公差原则是进行精度设计时处理尺寸公差与形位公差关系的指导原则。
3·These options control geometric tolerancing information!
这些选项控制几何公差信息！
4·Firstly, the concepts of dimensional element (DE) and dimensional element-chain (DEC) are defined, and a geometric tolerancing model expressed by DE and its semantic mapping are also given.
首先定义尺素和尺素链等概念，并在此基础上建立尺寸公差的尺素表示模型及其语义映射；
5·In the sixth chapter, all of the work in this dissertation is summed up. The future research of computer-aided tolerancing is prospected.
第六章：对全文进行总结，对计算机辅助形位公差的设计应该进一步开展的工作进行探讨和展望。