What should I prepare for the interview when the special equipment inspection office comes to my university to recruit technical posts? I majored in electrical engineering and automation.

You know what kind of organization the special equipment inspection office is. If it is a public institution, it is a subordinate unit of the quality and technical supervision department. Recruitment in your university should be non-staff, not contract. It seems that you are about to enter the society and graduate soon, right? What they ask can't be based on the knowledge in your books. Besides, your major doesn't fully match their positions. They want technicians. You can read the books on special equipment, because at least you know the basic knowledge of the profession of special equipment. Their questions are at work, not students'. I have graduated for three years, and I am also in the quality and technical supervision department. I understand your mood very well. Make preparations and look at special equipment more. Don't be nervous, they are all people, and you don't have to be too confident and arrogant, because you have begun to face the society, and you are no longer a student. The society doesn't like students' aggressiveness. If you do as I say and read more books on the post, you will have a great advantage over other interviewers.