The URL you provided refers to the equivalent of Baidu Library, Daokebaba, Douding.com and other document collection websites. When downloading documents on these websites, it is generally necessary to register a website account. However, some websites can only be downloaded by recharging after creating an account, and some open platforms upload and share by themselves. After downloading, you will accumulate wealth value in your account, and then you can download the files you need. Of course, if the file you want is free, after registering an account,
In addition, there are other pdf pages, which are composed of simple PDFs. In this case, you can save the pdf document by saving the page directly, as shown below.