Business department or production department. The front-line employees of enterprises stick to the front line of business production, and the production task is heavy and dangerous. It is the most basic and tiring department of an enterprise.

The production department is the most tired, and overtime is common. Long-term, high-intensity and repeated participation in mechanical labor make people physically and mentally exhausted and suffer from harsh environments such as high temperature. So the business department or the production department is the most tired.