1. Skill level: One-star repairman is a repairman with basic skills and knowledge, and can handle relatively simple maintenance tasks, such as replacing light bulbs and repairing faucets, while two-star repairman has a higher skill level and can handle more complex maintenance tasks, such as circuit troubleshooting and equipment maintenance.

2. Experience requirements: One-star maintenance workers need some practical work experience and are familiar with basic maintenance operations and processes. Two-star maintenance workers need more practical experience and are more skilled and confident in dealing with various maintenance problems.

3. Scope of responsibilities: One-star repairman is mainly responsible for daily maintenance tasks, solving the problems of small facilities and assisting its senior repairman to implement large-scale projects, while the second-star repairman is responsible for more complex maintenance projects, and needs to guide and train the first-star repairman.