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系统的概念 系统,就是由两个以上相互区别、相互依赖、相互制约、相互作用的单元间有机地结合起来完成某一功能的综合体,每一单元也可
The concept system of the system is a complex of two or more units that mutually distinguish, interdependent, and restrict and interact with each other to complete a certain function. Each unit can also be