Differents from traditional CAD system and Variant Design system, the product variant design system researched and developed is based on PDM and CAD integration, which has developed into a master model design and fast variant design based on master models, developed into a master models and variant cases manag.

An instance variable and an if statement are used skillfully in the process of design,which solves the problem of picture flash.

Research on the System of Fixture Resources Management and Fixture Instance Variations for MC;

By introducing several typical examples in earthquake isolation of building structures in Japan,the trends in Earthquake Isolation techniques of building Structures are summarized,and meanwhile,its prospects in china and several problems needed to be solved are indicated.

Based upon the teaching practice,this paper holds that important typical examples play important roles in the teaching practice of Calculus.

On the basis of an extensive collection and analysis of the related data and survey of the survival architectures,the authors deeply research its typical examples,then analyze its characteristics of space,form,material,equipment and decoration,finally summarize the value of Xi\'an modern times mansion architectures in both historical and architectural aspect.

Concrete analysis has been made according to the typical examples.

In this paper the current situation?typical examples?some problems and trend of tunnel boring machine in the long tunnel are introduced.

A way is describing the information with body features for the turning parts, other way is describing part form features bas-ing on typical instance for the box parts.