首页/ 题库 / [单选题]有研究者欲分析白酒的平均销售量与肝癌的死的答案

有研究者欲分析白酒的平均销售量与肝癌的死亡率之间的关系,收集了1998年全国20个大城市白酒的平均销售量与肝癌的死亡率资料。该研究者运用的研究方法是()。

单选题
2021-12-26 16:58
A、A.历史资料分析
B、随访研究
C、生态学研究
D、筛查
E、现况研究
查看答案

正确答案
C

试题解析

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