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详细介绍了利用allegro PCB设计的方法和技巧。配合大量示意图，介绍了印制电路板设计流程和常用电路模块的PCB处理方法(The method and skill of using Allegro PCB design are introduced in detail. With a large number of schematic diagrams, the design process of printed circuit board and the PCB processing me