1. Enter the URL
https://developer.aliyun.com/mirror/
2. Select centos and click to enter, click the download address link
3. Select a specific version number
4. Select isos
5. Continue to the next step to select x86-64
6. Select a specific version to download
Description of the ISO image file of each version:
CentOS-7-x86_64-DVD-2003.iso == "standard installation version (recommended)
CentOS-7-x86_64-Everything-2003.iso == "full version, integrating all software
CentOS- 7-x86_64-LiveGNOME-2003.iso == "GNOME desktop version
CentOS-7-x86_64-LiveKDE-2003.iso ==" KDE desktop version
CentOS-7-x86_64-Minimal-2003.iso == "Lite version, since The software with at least
CentOS-7-x86_64-NetInstall-2003.iso == "network installation version