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Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
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### 欢迎使用Markdown
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##### 新增图片上传功能
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现在可以在文章中插入图片！
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- 您可以插入外链图片，或上传本地图片到文档中。
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- 可上传的单张图片最大20M，支持PNG、JPG格式。
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- 若有其他疑问，欢迎咨询官网在线客服。
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### Welcome to the Markdown
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##### New feature! Insert pictures in your articles now!
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You can insert pictures from external links, or upload ones.
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The maximum size of the picture to upload is 20M. PNG and JPG are better.
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Have any other questions, please contact our official customer service.
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$$
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s_{\Delta B} = \sqrt{\frac{1}{n-1} \sum_{i=1}^{n} (\Delta B_i - \overline{\Delta B})^2}
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$$
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