隐性感染的特点是()
A.可诱导产生Tm、Bm细胞
B.可诱导宿主产生免疫应答
C.不产生临床症状
D.可作为传染源
E.不排出病毒
参考答案:A, B, C, D
Not until he left his home ______ to know how important the family was for him.
A.did he begin
B.had he begun
C.he began
D.he had begun
患者男,36岁。近一周来无明显诱因出现高热,体检除显著贫血貌外,无特殊阳性体征。实验室检查:外周血象全血细胞减少,网织红细胞明显减少;骨髓象提示骨髓增生低下。
该患者最可能的诊断是
A.白血病B.缺铁性贫血C.再生障碍性贫血D.巨幼红细胞性贫血E.脾功能亢进