网络的时钟同步方式有（）
A.全网同步
B.一组同步的子网
C.准同步
D.伪同步
参考答案：A, B, C
设n∈N*，定义一种运算：1*1=2，（n+1）*1=2（n*1），则log2（n*1）=______．
Which of the following statements about the market portfolio and the capital market line (CML) is least accurate The market portfolio:（）
A. assumes an equal amount is invested in each risky asset.
B. is perfectly positively correlated with other portfolios on the CML.
C. allows the elimination of all unsystematic risk at every point along the CML.
