Rules of it Elite Challenge School District Internal Selection 2020
It Elite Challenge Contestants Show Steps-Watermelon Video
https://www.ixigua.com/6874207862764077571/
The background of the book lending system project, the future expansion of the project, stage s1-Watermelon Video
https://www.ixigua.com/6874209643065770507/
The structure and function of the technical description of the book lending system-Watermelon Video