What are the main aspects of the professional examination of measurement and control technology and instruments when recruiting institutions?

First of all, it depends on your industry. I mainly do the control part of measurement and control, and entered the embedded industry. This includes two independent parts: hardware and software (either choose hardware or software, because the company will divide it in detail). I have done both interview and written test, because I have learned a lot, and my software and hardware feel ok. The hardware mainly tests analog, digital, single chip microcomputer structure and peripheral circuits. The software is mainly based on the embedded C language of keilC5 1. You can search online for written questions and interview questions. I searched a bunch in those days, and it was still very helpful.