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| Friction | |
| 作者： | P. Whitehouse |
| 出版社： | Britannica Digital Learning |
| 組合： | Read and Discover Series (Primary)_VI |
| 簡介： | Defines the concept of friction and how it can be helpful as well as when it is not. |
| 標籤： | 物理, 科普, 英文 |
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