1, two-shift system: divided into morning shift and night shift, each shift works for 8 hours, with a certain rest time in between, such as 7: 30- 1 1: 30 in the morning shift and1:30-5: 30 in the afternoon; Night shift: 1: 30-5: 30 and 7: 30-1:30 in the evening.

2. Three-shift system: divided into three shifts: morning shift, middle shift and night shift, each shift works for 8 hours, with a certain rest time in between, such as 7: 30- 1 1: 30 in the morning shift, 0/1:30 in the middle shift and 0/:30 in the middle shift.