维生素A缺乏症最早出现的表现是() ["A．眼干燥，夜盲","B．皮肤干燥","C．毛囊角化性丘疹","D．脱发"]
维生素A缺乏症的皮损好发于() ["A．暴露部位","B．四肢远端","C．四肢伸侧","D．四肢屈侧"]
什么是成人呼吸窘迫综合征？简述其病因、临床表现、治疗及护理。
肠病性肢端皮炎的皮损好发于() ["A．曝光和摩擦受压部位","B．皮肤细嫩和皱褶部位","C．腔口周围","D．躯干"]
逆行肾盂造影的禁忌证有() ["A．多囊肾","B．尿道狭窄","C．肾盂积水","D．严重的血尿","E．输尿管周围病变"]
什么是呼吸衰竭？
