Free China GB standard on line
China Standard Online (https://www.spc.org.cn) now open to registered members to review GB standard for free!
You need to register first with a cell phone number to receive verification code. Then you can review over 6400 GB standards on line for free.
Currently all GB standards are in Chinese. If you want to get English translations, please let us know. www.china-srrc.com
Below is a screenshot of GB4943 from the website.