你到底想证明什么呢，率的比较，抽样误差？中国人比美国人胖？

来源: mooseamoose 于 2012-11-30 20:51:19 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.