The types of work codes are indicated by English capital letters A to F respectively:
A: People who directly serve customers in public places B: People who are engaged in the production and operation of drinking water C: People who are directly engaged in the production of cosmetics D: People who are engaged in the fields of food circulation and consumption (including the production and processing of health food and the production of box lunch) E: People who are engaged in food production and processing enterprises F: Others (referring to those who are not explicitly engaged in the above work).