长期氧疗是指一昼夜持续吸氧______小时,吸入氧浓度为______,并持续较长时间,使PaO2上升到______以上的一种氧疗,常用于_________和_________的患者。
— ___________________
— Once or twice a week.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
免费的网站请分享给朋友吧