HBV感染进入后期与传染减低的指标是()
A.HBsAg(+)
B.抗-HBs(+)
C.HBeAg(+)
D.抗-HBc(+)
E.抗-HBe(+)
参考答案:E
Suddenly, all the lights in her house went _____. [ ]
A. of
B. off
C. up
D. down
IPSec不能提供以下哪种服务______?
A.流量保密
B.数据源认证
C.拒绝重放包
D.文件加密