There are no significanceofdifference of asphyxia rate between first delivery and second delivery of the twins.
双胎一产和二产之间窒息的发生率无明显差异；
2
According to the grade similarity and significanceofdifference of the productivity, we make cot the planting district of Picea Kdreainsis, and give out the hydro-thermal index.
The results showed that the concentration of Zn, Fe and Ni of the case group were all lower than that of the control group. that of Zn has specially significanceofdifference (P<0 01).