周期模型 meaning in English

periodic model

Research on life cycle model of distributed concurrent software
分布式并发软件生命周期模型研究
Technical product documentation - life cycle model and allocation of documents
技术产品文件生命周期模型及文档分配
Existence of positive periodic solutions of a class of delay differential equations
一类时滞周期模型正周期解的存在性
Technical product documentation . live cycle model and allocation of documents
技术产品文献.文件的寿命周期模型和分配
Business cycle model
经济周期模型

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