数学又出现了n,n+1集合的题。 还有68%mean of standard deviation, most average 84 with standard deviation 6, ask score 92 represent what percentile?没看懂题答案有:84,92,97.。。。。 阅读有whiter cloud better reducing radiation,introducing price with product life cycle, 其他都不记得了。 还要二战,唉