压缩文件里面包含：PCB布线技术；PCB层叠设计基本原则；串扰的形成与解决；混合信号PCB的分区设计；我也说说0欧姆电阻的用途；详解蛇形走线的作用。-Compressed file which contains: PCB routing technology　PCB design of the basic principles of layering　the formation and settlement of cross-talk　the district mixed-signal PCB design　I also talk about the use of 0-ohm resistors　explain the role of snake-like alignment.