Candidates compare the job list in detail, and staff A and B have no special meaning, in order to distinguish positions with different recruitment conditions in the same department. The two positions belong to the same department, but the recruitment conditions are different, so we should distinguish them. For example, A may require fresh graduates, and B may require two years of grassroots work experience. Candidates only need to look at the recruitment requirements of the position, whether it is ABCD or not, the letters have no effect on the application.

If in doubt, please consult the public education enterprises in China.