教材：更新 PDF，包含封面图

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之前提交源码时用 git checkout 还原了 PDF，导致仓库里的成品
还是无封面图的旧版。本次提交重新编译的版本。

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laoyang

2026-11-01 12:39:07 +08:00

parent 203e490197

commit 687aa0a5b4

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教材/教材.pdf

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