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1990年某市为了调查老年人中多发病的分布情况,对该市7个区的9个不同地段抽取60岁及以上的老年人7458例进行调查,这是()。
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1990年某市为了调查老年人中多发病的分布情况,对该市7个区的9个不同地段抽取60岁及以上的老年人7458例进行调查,这是()。
A、分析性研究
B、抽样调查
C、普查
D、筛检
E、发病率调查
时间:2021-12-27 23:03
关键词:
流行病学
卫生毒理(医学高级)
传染性疾病控制
疾病控制(医学高级)
答案解析
B
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