1. The work report is a report about your experience, professional knowledge and the ability of the position you are applying for. The general subject is required by the employer. They want to check your report writing level, self-recommendation ability and resume, and have a comprehensive understanding of you.
Generally speaking, the main body of the cover letter is the job seeker, aiming at recommending yourself to the employer.
3. Resume, that is, your own study and work experience, is relatively simple.