下列哪种病毒直接电镜观察有特征:() ["脊髓灰质炎病毒","柯萨奇病毒","埃可病毒","人类轮状病毒","甲型肝炎病毒"]
脊髓灰质炎病毒最主要的感染类型是:() ["急性感染","隐性感染","慢性感染","潜伏感染","迟发感染"]
引起小儿麻痹的病原体是() ["脊髓灰质炎病毒","螺旋体","腺病毒","衣原体","轮状病毒"]
下列何种核型的AML对治疗反应良好,缓解期长() ["t(15:17)","t(4:11)","t(9:22)","t(9:21)","t(8:14)"]
属于染色体结构异常的是() ["缺失","随体","多倍体","插入","嵌合体"]
简述口腔白斑病鉴别诊断。