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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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