以下疾病中主要好发于婴儿且与血锌浓度降低有关的是() ["A．着色性干皮病","B．掌跖角化病","C．肠病性肢端皮炎","D．急性发热性嗜中性皮病"]
间擦性黄瘤为发生与下列哪个部位的扁平黄瘤() ["A．上眼睑内眦处","B．手掌","C．颈部","D．腋下"]
烟酸缺乏症的三联症不包括以下哪项() ["A．皮炎","B．腹泻","C．痴呆","D．便秘"]
对烟酸缺乏症治疗的关键是() ["A．避免日晒","B．补充富含烟酸的食物","C．肌注烟酰胺","D．去除和治疗病因"]
什么是呼吸困难？
支气管扩张有哪些典型症状？
