题目内容：
时点患病率在理论上是无长度的，但实际上以不超过多长时间为度
参考答案：
答案解析：
单选题：时点患病率在理论上是无长度的，但实际上以不超过多长时间为度
- 题目分类：公卫助理医师
- 题目类型：单选题
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