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本文从研究网络结构及通讯方式入手，从实践及理论两方面论证在微机磁卡系统中采用树形网结构及多电源供电的必要性。
This article starts with the study of network structure and communication mode, and demonstrates the necessity of adopting tree network structure and multi-power supply in microcomputer magnetic card system from two aspects of practice and theory.