在市场的均衡状态下，有些证券在切点组合T中有一个非零的比例，有些证券的组合中的比例为零。()

未分类题亲系分为()

未分类题下列属于旁系姻亲的有()

判断题投资者如何在有效边界中选择一个最优的证券组合，取决于投资者对风险的偏好程度。()

未分类题Which of the following is true according to the first two paragraphs?A．American espionage operations only take place in European continent.B．Some European politicians decide to take actions against America.C．The Europeans are quite furious at America, but with no agreed measures.D．European countries refuse to provide refugee to Edward Snowden.

判断题有效组合在各种风险条件下提供最大的预期收益率。()