All right. The salary level of interns is lower than that of regular employees, because interns lack work experience and skills and need to study and train during their internships. Therefore, the salary level of 3500 yuan is reasonable for an operation and maintenance intern. The salary level in Zhengzhou is relatively low, which has a certain gap compared with first-tier cities. Therefore, the salary level of 3,500 yuan is relatively common in Zhengzhou's internship market.