网络课堂系统，主旨在在Internet上构建多个虚拟教室，营造师生互动的网络环境。 她比传统教室教学更为生动活泼，可以为学员提供时间上更灵活，没有地域限制，更高效率、更省费用的培训课程-classroom network system, the aim of the Internet build multiple virtual classroom, teachers and students to create an interactive network environment. She t

stm32l152实现智能水表程序,低功耗实现省电(Stm32l152 implementation of intelligent water meter program, low power consumption to save electricity)

stm32和W5500的DNS例程，官网上也有，只不过为了省时间而已。(The DNS routine of STM32 and W5500)