The meanings of four-tier structure and key technique are explained, A four-tier structure model is proposed, it is showing tier, operation logic tier, date visiting tier and database.
阐述软件设计开发的四层结构的组织形式及其关键技术，提出了一种基于。
The meanings of four-tier structure and key technique are explained, A four-tier structure model is proposed, it is showing tier, operation logic tier, date visiting tier and database.
阐述软件设计开发的四层结构的组织形式及其关键技术，提出了一种基于。
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