From 0e5243fb2429df0fb2ecb4c896ef88339efd501e Mon Sep 17 00:00:00 2001
From: Zhao Zuohong <1040110848@qq.com>
Date: Sun, 1 Nov 2020 17:12:35 +0800
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 source/_posts/downloads.md | 2 +-
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diff --git a/source/_posts/downloads.md b/source/_posts/downloads.md
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@@ -41,7 +41,7 @@ tags:
 
 [第二次上机讲解.pptx](/~zhaozuohong/resources/Experiment2.pptx)
 
-[第三次上机讲解.pptx](/~zhaozuohong/resources/Experiment3.pptx)
+[第三次上机讲解.pdf](/~zhaozuohong/resources/Experiment3.pdf)
 
 # 其它参考资料