描述测量数据在中心位置(均值)上下波动程度差异的值叫()。
参考答案:方差
She ______buy her clothes through the Internet than in the supermarket.
A.rather than
B.would like
C.no longer
D.would rather
金融远期的缺陷包括()
A.市场效率低
B.流动性差
C.违约风险大
D.费用高
E.获利有上限