According to their birth style 217 children were chosen and divided into 3 groups: spontaneous delivery, cesarean section for social factors and cesarean sec.

Methods A comparative study was performed on 100 primiparae undergoing cesarean section and 100 primiparae with spontaneous labor.

A large amount of waste gas containing un-reacted raw material,by-product carbonic oxide and volatile organic compounds is discharged in the course of maleic anhydride production,so it is crucial to treat the waste gas and change the harmful matter to harmless matter and release it according with the standard.

The production sequence problem of the mixed-model production line was discussed.

In order to look for the influencing factors of the single-fetus delivery inpatient expenditure and rationally control the excess growth of the insured patients,this paper makes an in-deep analysis of single-fetus delivery inpatient expenditure.