Extracurricular credits. COVID-19 Nuclear Sampling Personnel Training Certificate is an extra-curricular credit of the university. Students participating in social practice, voluntary service, work-study programs, innovative experiments and other activities, as well as starting their own businesses, publishing papers, obtaining patents, etc., can be converted into credits and included in their academic performance. The training certificate of nucleic acid detection technicians is a photo, and the training certificate of electronic nucleic acid sampling is issued.