What are the four categories of health certificate ABCD?

According to a staff member of Changsha Health and Epidemic Prevention Station, according to the Administrative Measures for Preventive Health Examination issued by Order No.41of the Ministry of Health on June 2, 1995, the main people who apply for health certificates include employees in public places, workers engaged in hazardous operations, radiation workers, students and other groups. The contents of preventive health examination include: for those engaged in food and drinking water production and management, cosmetics producers and those who directly serve customers in public places, mainly check viral hepatitis, dysentery, typhoid fever, active tuberculosis and skin diseases; Mainly check the occupational contraindications, occupational diseases and occupational diseases of hazardous workers and radiation workers; Students in school mainly check their growth and development, health status and common, infectious and endemic diseases.