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当前学科:妇女保健(医学高级)
题目:
单选
流行病学研究的观察法与实验法的根本区别在于()
A . 盲法
B . 是否人为控制研究的条件
C . 设立对照组
D . 不设立对照组
E . 统计学检验
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