如何发现存在系统误差?
外源性支气管哮喘多属于() ["第Ⅰ型或速发型变态反应","第Ⅳ型或迟发型变态反应","第Ⅲ型或免疫复合物反应","第Ⅱ型或细胞毒型反应","以上都不是"]
胃溃疡最好发于() ["胃底部","胃体部","胃窦小弯角切迹附近","胃窦近幽门前区","胃体底交界处"]
氨茶碱的适宜浓度为() ["10~20mg/L","20~25mg/L","25~30tug/L","25mg/L","5~10mg/L"]
降低胃内酸度作用最强的药物是() ["含铝抗酸剂","H2受体拮抗剂","质子泵抑制剂","抗胆碱能药物","胃泌素受体拮抗剂"]
赵先生,40岁。突发上腹痛6小时。腹肌紧张,立位腹平片膈下见游离气体。拟行上腹部剖腹探查术。已完成术前准备,赵先生仰卧于手术台上。要求:请用碘伏为患者(医学模拟人)进行手术区域皮肤消毒,并铺手术巾、手术单。