In addition, due to the instability of the server, some data has been damaged, some pages cannot be accessed or some files cannot be downloaded. I hope you can understand.
I may give you a suggestion. You can go to the official website of some standard documents to find relevant introduction or relevant information. Sometimes you can download the first few pages of some documents on the official website, which can understand what the standard is about. I hope my suggestions will be helpful to your study and work.
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