您的購物車是空的
阿基米德的蹺蹺板。
I bet I can tilt the balance of the seesaw without touching the glasses or the seesaw itself, or without changing the amount of water in the glasses.
物理
成績7 – 12
作者: Stonawski Tamás
審稿人: Dr. Sós Katalin
mozaLink
/網頁鏈接