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当前学科：公卫执业助理医师
题目：
单选题
计算患病率的分子是（）
A
观察期间某病的新发病例数
B
观察期间某病的现患病例数
C
观察期间之前某病的患病人数
D
观察期间某病的暴露人口
E
以上均不是
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