Chinese mainland: App Store, Apple Music, Apple Podcasts and "Video" apps.
Apple Books and Books are not included, so it is normal that they cannot be used.
Complete Apple media services include: App Store, Apple Music, iTunes Store, movies, TV programs, music, ringtones and tips, Apple TV applications, Apple Books, books, audio books, Apple podcasts, Apple News, and Apple News+.
Extended data:
The iBooks store has been banned in China, so you can't download any book resources. You can search PDF books online, import iBooks, and read them through various "assistants" on your computer.
Depending on the country or region where the user is located, the user may not be able to buy or download some types of media. Availability and functionality of certain applications, videos, etc. It may be different.
If you think your country or region should provide applications or other media, please contact the developer or publisher directly.
In addition to the app store, itunes store and apple books, the availability of other apple services may vary by country.
Apple's Official Website-Apple Media Terms of Service