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。()

未分类题While many specialists call for a disclosure mechanism, some physicians are worrying about______.A．exposure to the mediaB．describing their mistakes in detailsC．compensating victims promptly and fairlyD．involvement in an expensive civil case

未分类题C. How Money Makes You Lie and Cheat D. Why Money Is Regarded as Corrupting Your friend Wang Hua has just been admitted to Nanjing University. Write a letter to 1)congratulate him and 2)send your good wishes for his future. You should write about 100 words on the ANSWER SHEET. Do not sign your own name at the end of the letter. Use 'Li Ming' instead. Do not write the address.

判断题以协方差表示的证券风险与证券预期收益率之间的线性关系称为证券市场线。()