THE RESCUE METHOD OF NEONATAL PULMONARY HEMORRHAGE: POSITIVE PRESSURE VENTILATION Significance of rescue method used in war wound sorting team of first line hospital in the first aid of mass trauma in peacetime sudden colony 应用正压呼吸抢救新生儿肺出血一线医院战伤分组救治法在平时突发性群体伤急救中的意义