Knowledge tree registration failed.

Check whether it is a valid ID number. The valid ID number of residents consists of 17-bit ontology code and 18-bit check code. As the tail number, the check code is calculated by the numbering unit according to a unified formula. If someone's suffix is 0-9, X will not appear, but if the suffix is 10, X will be used instead. Therefore, if you prompt "Not a valid ID number or ID number is registered" when creating an account. The wisdom tree is a global large-scale credit course operation service platform, and the online education platform has a large number of high-quality courses in colleges and universities.