| Physics4Kids.com | |
| 网站标题： | Rader&*39;s PHYSICS 4 KIDS.COM |
| 网站简介： | Physics4Kids.com! The web site that teaches the basics of physics to everyone! |
| 关键字： | physics4kids chem4kids rader physics motion heat thermodynamics electricity magnetism light electromagnetic sound motion modern physics nuclear physics newton einstein energy ca |
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