Group B:L/min oxygen nebulizer inhaler 0% berotec,0μg/kg each time and dexamethasone mg,0minutes.
Group B:L/min oxygen nebulizer inhaler 0% berotec,0μg/kg each time and dexamethasone mg,0minutes.
B组 :L/min氧驱动雾化吸入 0 %备劳特液每次 0 μg/kg ,加用地塞米松 mg ,雾化吸入 0min ;