无线上网技巧、天线制作(可免费上网)，简单易学，实用方便。-Wireless Internet skills, antenna (free access to the Internet)

仔细研究整理的非常实用的波浪理论口诀，配合图标很容易理解记忆，并方便实战应用。-Finishing a very careful study of the wave theory and practical formulas, with easy to understand icons and memory, and to facilitate practical applications.

比较全的matlab函数集，全面、方便、实用.-Matlab function set, very practical, convenient and effective.