Need Help?

If you don’t find the standard you need on my personal website or you can’t downlpad some of them, you can email me and I will try my best to help you find it for you.
My email address: [email protected]

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.