protel dxp 的指导教程，对初学者有很大作用，protel原理图，protel的PCB板的制作等都有很详细的讲解-There protel dxp use of detailed briefings on the beginners have a significant role, protel schematic, protel the PCB board production, etc. are very detailed explanation. . .

详细介绍了PCB板的制作过程和注意事项，是华为的内部资料。非常有用。-we introduce the process of producing PCB in the paper. it will be helpfull for you.

华为PCB的布线标准和规则，对于学习绘制PCB的朋友很有帮助，能让你对PCB制作更加规范-Huawei PCB wiring standards and rules for the helpful friends learn to draw the PCB, make you more standardized PCB production