12×34+12÷34,
=9+12÷34,
=9+16,
=25;
答:甲乙两数的和是25.
I caught a bad cold last month and it took a whole week for me to ______ from it. [ ]
A. return
B. recover
C. treat
D. cure
有关HCV的描述错误的是()。
A.是单股正链RNA病毒
B.基因高度稳定
C.抗-HCVIgM持续阳性,可能已转为慢性肝炎
D.传播方式与HBV相同
E.抗-HCVIg;阴性表明病毒复制停止