开关电源pcb规范，感觉挺好的，开关电源布线要求比较高，把它搞懂了，其他的就是小菜，-Switching power supply pcb specification, feeling quite good, switching power supply wiring required is relatively high, it get to know the other is the side dish, huh, huh

麻省理工大学的研究生,课堂笔记，可以学到很多东西的哟！-Massachusetts Institute of Technology graduate, class notes, you can learn a lot of yo!

GSM11.11协议，智能卡开发需要的，不可多得-GSM11.11 agreement required the development of smart cards, and rare

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