手机元件及功能介绍，真正认识和理解什么是元器件-Phone components and functions described, the real knowledge and understanding of what components

S7 1200最新版的，元器件选型手册，最近S7 200PLC已经开始停止生成，难以购买，替代产品为S7 1200 ,发出来大家共享；(S7 1200 latest version of the component selection manual, the recent S7 200PLC has begun to stop generation, it is difficult to buy, alternative products for S7 1200, sent out to sha

Optisystem中所有元器件的使用说明，及参数设置(Instructions for the use of all components of Optisystem and the setting of parameters)