administrator:
1. [Log out, add student information, manage student information, add teacher information, manage teacher information, add course information, manage course information] powered by 25175.net
Test account password admin
student:
1. Query the course list and select the course. Test account password is 25175.
teacher:
1. Query the courses taught [Course number, course name, class time, teacher operations] Modify course score Test account password 25175
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