社会分化的社会文化因素有()。
A．职业的差异
B．文化的差异
C．阶层的差异
D．阶级的差异
E．智力的差异
参考答案：B, C, D
原型化方法最后得到的需求规格说明书是下列的______。
A．过程性说明
B．陈述性说明
C．图形性说明
D．数据字字典说明
An analyst is doing research about survivorship bias and its impact on measurement ratios. With a failure to comply with performance presentation standard, hedge fund databases and indexes, which are most likely to overstate:（）
A. Sharpe ratios.
B. standard deviation of retums.
C. correlations with returns from common stocks.
