Beijing Changqing Electric Power Technology Co., Ltd. wants to keep my diploma. Should I give it to them? What about this company?

After you go, don't worry about whether you can do it. First, you need a high salary of 7000-9000. The boss will give you money. If you want to brag, you can stay at school because you know nothing about the applicant. The company is short of people, interviewing in the morning and going to work in the afternoon. He won't give you a raise if you come to talk about less pay. If you ask for a long one, you can leave.