Need Help?

If you don’t find the standard you need on my personal website, you can email me and I will try my best to help you find it for you (not for free).
My email address:
In addition, searching for documents will take a long time, so according to the difficulty of searching for documents, I will charge a service fee of US $5 for each document, because there are more people who send me e-mail every day for help, and I don’t have much time to reply to them because I still have to work every day. I hope you can understand me.
If you have such a need, please email me.

Finally, I would like to state a few points:
1. is a personal non-profit website. My website doesn’t sell any standards. Please go to the official website to buy the authentic standards.
2. All the content on my website is from the Internet, and the copyright belongs to the original author.
3. If the content I share violates your rights and interests, please email me and I will delete it in time.
4. I share these contents only for study. They are forbidden to be used for business activities.