用visual basic 编程的一个题库，有登陆界面，还有选题，还有实验报告，运行通过。-Visual basic programming with a Q & A, a login screen, as well as topics, as well as lab reports, run through.

用 visual basic 编写的四杆机构设计的控件界面，适合机械类专业-Four institutional design of the control interface, written in visual basic for Mechanical Specialty