Using Top-Down design method, the whole PDDC function is divided to many units implemented respectively and organized to the module library.
采用自上向下的模块化设计方法，将PDDC的功能划分为基本单元，实现这些功能模块并组成模块库。
The modeling method oriented to design of hydraulic valve library is presented in this paper.
提出了面向设计的液压阀库建模方法。
On this basis, carry on the systematic design of standard part library structure; give each module concrete structure method.
在此基础上，进行标准件库的系统结构设计，针对其主要内容给出各个模块具体的构造方法。
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