外科疾病由多种原因引起,但主要是由于()。 ["风温、风热","火毒、热毒","气郁、火郁","外感、邪毒","湿热之邪"]
外科疾病的主要病理基础是()。 ["气血凝滞,外感热毒","气血凝滞,脏腑失调","气血凝滞,经络阻塞","气血凝滞,正气虚衰","气血凝滞,情志内伤"]
外科疾病致病因素哪项是错误的?() ["外感六淫邪毒","感受特殊之毒","气血瘀滞,情志内伤","饮食不节,情志内伤","房室损伤,外来伤害"]
气瘿在何种情况下不宜手术治疗?() ["肿块巨大","内治无效","青春期","压迫气管","压迫血管"]
线路单相短路是指()。 ["A、电流太大","B、功率太大","C、零火线直接接通"]
在同一条件下,测得某段线路电压值分别为220.1V,220.5V,220.7V,220.4V,220.6V。?求测量值(平均值)m和标准偏差s?