The second category is generally on-site work, such as sales, some factory leaders who don't need to do it themselves. All belong to the second category.
Three types of occupations generally do some light manual labor, such as fruit farmers.
More than four categories are basically high risk factors, such as rubber tapping workers, Chinese herbal medicine pickers and mine managers, which are higher than the previous three categories and belong to four categories of occupations;
Many occupations, such as general geology and mineral industry, some highway transportation occupations, metallurgy industry, civil construction, etc., all belong to five categories, such as water and mud workers and tractor drivers.
Six types of occupations belong to high-risk occupations. In addition to the above industries, some occupations belong to six categories, and there are also some six categories of occupations in the shipping industry. For example, all kinds of pilots belong to six high-risk occupations.
Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.