File:一個時刻入面葵循物理堂嘅黑板.png
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![File:一個時刻入面葵循物理堂嘅黑板.png](https://upload.wikimedia.org/wikipedia/commons/thumb/9/97/%E4%B8%80%E5%80%8B%E6%99%82%E5%88%BB%E5%85%A5%E9%9D%A2%E8%91%B5%E5%BE%AA%E7%89%A9%E7%90%86%E5%A0%82%E5%98%85%E9%BB%91%E6%9D%BF.png/793px-%E4%B8%80%E5%80%8B%E6%99%82%E5%88%BB%E5%85%A5%E9%9D%A2%E8%91%B5%E5%BE%AA%E7%89%A9%E7%90%86%E5%A0%82%E5%98%85%E9%BB%91%E6%9D%BF.png?20170219115806)
Size of this preview: 793 × 600 pixels. Other resolutions: 318 × 240 pixels | 635 × 480 pixels | 1,016 × 768 pixels | 1,280 × 968 pixels | 2,560 × 1,935 pixels | 3,500 × 2,646 pixels.
Original file (3,500 × 2,646 pixels, file size: 6.9 MB, MIME type: image/png)