说明：  pcb设计及生产流程的一些基本常识 産過程中要涉及到的基本概念 PCB生産過程一瞥 电路板组装之焊接 用感光电路板自制PCB Protel快捷键
(pcb design and production processes of some of the basic knowledge of production process to the basic concepts involved in the production process at a glance PCB circuit board assembly of the welding circuit boards made with photosensitive PCBProtel shortcuts)