一款非常好用的折图软件，希望和大家一起分享。-A very nice folding map software, I hope to share with everyone.

PDAS电子元件库及封装库,非常好用的封装库(parts electronic of PADS software)

《VBA数字成图》非常好用的测量画图软件，功能强大，容易学习参考，代码分类清晰明了。("VBA digital mapping" is very useful for surveying and mapping software, powerful, easy to learn reference, code classification clear and clear.)