Aren't all the regular workers who entered Sinopec through school recruitment?

Those who do not enter Sinopec through school recruitment are formal workers.

Undergraduate students recruited by Sinopec are regular employees, and Sinopec system units recruit a certain number of fresh college graduates every year.

China Petrochemical has been committed to the research and development of lithium-based anionic polymerization for many years, and has advanced SBS production technology in this field.