您的购物车是空的
阿基米德的跷跷板。
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
成绩7 – 12
作者: Stonawski Tamás
审稿人: Dr. Sós Katalin
mozaLink
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