How many contracts does CNOOC have? What kind of contracts do college students and junior college students sign after they are hired?

Before the reform, it was generally divided into enterprise labor system, enterprise employment system and social employment system. After the reform, it is generally considered as employee system. At present, the reform is still going on, and many units have delayed it for 2-3 years. Now, if they enter the company, it is generally a social employment system. The contract is signed every few years, depending on which company you enter. The treatment of many companies varies greatly. The work is hard and the income of grass-roots employees is very poor.