这个是TR800 GPRS模块的有关详细资料。里面有用户手册，AT指令。有关与TR800的都有了。-This is the TR800 GPRS module details. There are user manuals, AT commands. With the TR800 have.

变频技术原理及应用，Bosch培训内容，简单介绍变频器原理和应用，适合初学者-Principle and application of inverter technology, Bosch training, principles and applications of a brief drive, suitable for beginners