读报
登录注册网站首页
 

Get Ahead

Quiz

Aa
  • -   
  •    +
Build a fence around the world

A farmer challenged an engineer, a physicist, and a mathematician to fence off the greatest area using the least amount of fence.
点击阅读全文
联系我们  |  诚聘英才  |  关于我们  |  版权声明
© i21st.cn   京ICP备2024066071号-1
 
选择报纸
选择报纸
关闭