引起肠道感染的大肠埃希菌有哪些?其常用检验方法如何?
先天性代谢病的常见临床症状,不包括() ["A.代谢性酸中毒","B.血清乳酸降低","C.生长迟缓","D.多发畸形","E.呕吐"]
标准型21-三体综合征的核型为() ["A.47,XY(XX),+21","B.46,XY(XX),-21,+t(21q21q)","C.46,XY(XX),47,XY(XX),+21","D.46,XY(XX),-14,+t(14q21q)","E.45,XY(XX),-14,-21,+t(14q21q)"]
外耳道疖是外耳道皮肤____或____的化脓性感染。
哪项是常染色体显性遗传的特征() ["A.患者的父母及子女均健康","B.患者同胞的发病机率为25%","C.父母有血缘关系者较多见","D.男性多见","E.患者的父或母患病、同胞的发病机率为50%"]
先天性耳前瘘管多为第_____鳃沟封闭不全所致。