...requirements engineering 工程安全要求 ; 需求分析 ; 安全需求工程 requirements engineering framework 中的系统需求工程框架 ; 系统需求工程框架 ; 需求工程框架 software requirements engineering program 软件要求工程程序 ..
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转换到系统需求工程框架。
然后再结合软件工程和IEC61131-3国际标准，对PLC程序开发系统进行了需求分析并设计了总体结构框架。
Then, the requirements of the soft PLC platform are considered, and the overall structure of the system is designed based on software engineering and IEC61131-3 international standard.
特征模型本质上也是一种需求的组织方式，在以产品线工程为基础的应用系统开发活动中，特征模型为该系统的需求提供了一个复用的框架。
Feature model is a form of organizing requirement essentially, which provide a reusable framework for the requirement of the application system in the development of it based on SPL.
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