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下列哪项特征不是队列研究的特点()

单选题
2021-12-28 08:25
A、所得结果为结论性的
B、容易产生选择性偏倚
C、一次调查涉及一个因素
D、调查时间较长
E、可用人年计算死亡率
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正确答案
B

试题解析

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