题目内容 （请给出正确答案）
[主观题]

Which rank of study design correctly shows the strong to weak causal evidence ？

A、Randomized controlled experiment, single-group time series experiment, multi-group time series experiment, no control before and after comparison experiment

B、Randomized controlled trial, case-control study, case-control study nested in a cohort,ecological study

C、Prospective cohort study, case-control study nested in a cohort, case-control study, cross-sectional study

D、Historic cohort study, prospective cohort study, case-control study, cross-sectional study

提问人：网友billy1314 发布时间：2022-01-07
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