送交者: cornbug 于 2013-06-18, 22:38:54:

回答: 非洲人呢？ 由 whatistruth 于 2013-06-18, 22:32:00:

• 没有对照组 (无内容) - whatistruth (0 bytes) 2013-06-18, 22:41:11 (720490)
  • 年数太长，不可设计的control实研。实研员会死掉实研还没完 (无内容) - cornbug (0 bytes) 2013-06-18, 22:45:22 (720491)
    • 吃毒的和没有吃毒的 - whatistruth (48 bytes) 2013-06-18, 22:49:22 (720492)
      • need preliminary data for an experimental design. - cornbug (290 bytes) 2013-06-18, 23:05:56 (720496)
        • there're people did eat and not eat. (无内容) - whatistruth (0 bytes) 2013-06-18, 23:12:53 (720498)
          • That is why there is a need of large population - cornbug (114 bytes) 2013-06-18, 23:17:12 (720499)
            • 你的假设是中毒人口已经占绝大多数了？那这个不是现在讨论 - whatistruth (92 bytes) 2013-06-18, 23:46:04 (720502)

加跟贴