A. Criminals are abused by prison officers. B. Innocent defendants are found guilty. C. Lawsuits pile up. D. Laws are often misinterpreted by judges. 参考答案:B 答案解析:根据文章第二段的第三句“Yet the practice occurs in many courts,and the consequence is that an innocent defendant
第12题: [单项选择]用于度量各种金融资产之间收益相互关联程度的统计指标是( )。 A. 方差 B. 期望收益率 C. 标准差 D. 协方差 参考答案:D 答案解析:[解析] 协方差是一种可用于度量各种金融资产之间收益相互关联程度的统计指标。期望收益率衡量单一金融资产或由若干金融资产构成的投资组合的预期收益。方差和标准差衡量单一金融资产或由若干金融资产构成的投资组