Apply the theory of software reuse to the development of nc system, draw the definition of software IC conception, give an expatiation on the functions and interfaces of software ICs.
阐述了软件芯片的特点、功能划分和接口，并以所开发的镗铣床数控系统为例，对基于软件芯片的开放式数控系统的重构过程给予了详细阐述。
The expatiation is shown in the paper firstly about the concept and framework of Digital city and comparative study of development of Digital city at home and abroad.
本文首先阐述了数字城市概念和框架，并对国内外数字城市建设进行对比分析。
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