What is new about this year's meeting?
[A] The cost for registration is low.
[B] It offers money to some groups.
[C] Individual students are welcome.
[D] There is wireless Intemet service.
第7题
A.HBV感染率随年龄增长而增加
B.HBsAg携带率,女性高于男性
C.抗-HBs阳性率,男高于女
D.发病以青壮年多见
E.医务人员的感染率往往高于普通人群
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