单项选择题

比值比主要应用于现况研究B．生态学研究C．随访研究D．队列研究E．病例对照研究比值比主要应用于现况研究 B．生态学研究 C．随访研究 D．队列研究 E．病例对照研究

A.现况研究
B.生态学研究
C.随访研究
D.队列研究
E.病例对照研究

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