To particularize the implementation of the concurrent process planning systems, and put forward the functional requirements and architecture of product manufacturability evaluation.

详了并 行工艺设计系统的实现方法，提出了产品可制造性的功能要及其体系结构。

Based on practical example,the authors of this paper particularize the method how to deal with the crevice and give some suggestions to prevent it.

结合工程实例,详了预应力管桩缺陷部分的理和方法,并从施工角度给出了合理的预防裂缝出现的建议。