我国乙型肝炎的最主要的传播途径是 ["A.输血或血液制品","B.接触传染","C.性传播","D.母婴传播","E.消化道传播"]
慢性化率最高的病毒性肝炎是 ["A.甲型肝炎","B.乙型肝炎","C.丙型肝炎","D.丁型肝炎病毒单独感染","E.戊型肝炎"]
由买方负责出口清关手续,并承担相关费用的贸易术语是() ["FCA","B.FAS","C.EXW","FOB"]
患者,男性,35岁,乏力消瘦2个月,腰部可见带状疱疹,血中HIV抗体检测阳性,CD4T细胞0.3×10/L,此患者属HIV感染的临床分类的类别和级别是 ["A.A类3级","B.B类2级","C.B类3级","D.C类2级","E.C类3级"]
单股负链RNA病毒,含有大、中、小三个基因片段,分别编码:RNA聚合酶、囊膜糖蛋白G1和G2,以及核蛋白N。该病毒为 ["A.HCV","B.HEV","C.汉坦病毒","D.SARS冠状病毒","E.脊髓灰质炎病毒"]
国际互联网(WWW)与因特网(Internet)的比较