2. I'm not familiar with petrochemical companies, so Huaying can understand that she hasn't heard of it. For the authenticity of this company, you can check industrial and commercial registration in Huizhou Industry and Commerce. Regular companies are registered.
3. Technical undergraduates will do their own technology in the first 3-5 years, and it is better to go out to run the market (business) after they have done it almost. If you work alone in this company, there is no future.
4, the enterprise is for the purpose of profit. There are not many opportunities for academic exchanges in the company to earn technology patents. I think, if you follow the above three rules, you will have a chance to make money before you are 30.