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当前学科:病毒感染
题目:
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流行性出血热的流行病学特征是()
A . 主要分布于欧洲
B . 以儿童发病率高
C . 老年人发病率高
D . 男性青壮年农民和工人发病率高
E . 我国各省均有病例发生
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