在一项队列研究中,某年龄组的观察人数如下 计算其暴露人年数为(  )A.9000B.3010C.4010D.3760E.6000

作者: rantiku 人气: - 评论: 0
问题 在一项队列研究中,某年龄组的观察人数如下 计算其暴露人年数为(  ) A.9000 B.3010 C.4010 D.3760 E.6000
选项
答案 C
解析

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