After coming to the WeChat public platform, register a WeChat WeChat official account. Click "Register Now" in the upper right corner to jump to registration. After coming to the registration interface, you will of course register your own WeChat WeChat official account.

Fill in your own email address. My personal suggestion is QQ mailbox. After all, they are all Tencent's own products, and WeChat and QQ are closely related! The mailbox should be available, because it needs to be verified when registering!

PDF is mainly composed of three technologies:

Derived from PostScript, used to generate and output graphics.

Font embedding system enables fonts to be transmitted with documents.

A structured storage system that binds these elements and any related content into a file through an appropriate data compression system.

PDF files use industry standard compression algorithms, which are usually smaller than PostScript files and easier to transmit and store. It is also page independent. A PDF file contains one or more "pages", which can handle each page independently, especially suitable for multiprocessor systems.

A PDF file also contains the PDF version used in the file and the positioning information of some important structures in the file. It is precisely because of its various advantages that PDF files have gradually become the new favorite of the publishing industry.