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What is a PDF? Portable Document Format | Adobe Acrobat
What is Portable Document Format (PDF)? - TechTarget
PDF - Wikipedia
什么是PDF(便携式文档格式)文件以及如何打开PDF?-CSDN博客
Different PDF File Types Explained | Adobe
What is PDF Format? - DocFly
What Is PDF? Meaning, Benefits, & History | Smallpdf
Portable Document Format - Techopedia
PDF (Portable Document Format) - CyberHoot
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