> For the complete documentation index, see [llms.txt](https://sotay.ehs.vn/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sotay.ehs.vn/an-toan-suc-khoe-moi-truong/an-toan-may/thiet-bi-nang/ring.md).

# Ring

![](https://970536015-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LiWHHtX5qwdAhac796j%2F-MdOWFvPDci5xe4tD-Uh%2F-MdOXpdrKWYoRu83eoCD%2Fimage.png?alt=media\&token=668e29fb-6fe1-4bab-b756-1bce859a469e)