PCI-6251

在程序设计中，为完成某一功能所需的一段程序或子程序；或指能由编译程序、装配程序等处理的独立程序单位；或指大型软件系统的一部分。

模块,又称构件,是能够单独命名并独立地完成一定功能的程序语句的集合（即程序代码和数据结构的集合体）。它具有两个基本的特征：外部特征和内部特征。外部特征是指模块跟外部环境联系的接口（即其他模块或程序调用该模块的方式，包括有输入输出参数、引用的全局变量）和模块的功能；内部特征是指模块的内部环境具有的特点（即该模块的局部数据和程序代码）。

模块有各种类型，如单元操作模块（换热器、精馏塔、压缩机等）、计算方法模块（加速收敛算法、最优化算法等）、物理化学性质模块（汽液相平衡计算、热焓计算等）等。

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