影响乳状液稳定性-固体粉末的加入
参考答案：
聚集于油水界面的固体粉末增加了界面膜的机械强度，而且，固体粉末排列的赿紧密，乳状液趋稳定。
在一块三角板中，有两个角的度数相等，这块三角板的三个角中最小的角是______度．
An analyst compared the performance of a hedge fund index with the performance of a major stock index over the past eight years. He noted that the hedge fund index (created from a database) had a higher average return, higher standard deviation, and higher Sharpe ratio than the stock index. All the successful funds that have been in the hedge fund database continued to accept new money over the eight-year period. Are the average return and the standard deviation, respectively, for the hedge fund index most likely overstated or understated（）
A. Both average return and standard deviation are overstated.
B. Average return is overstated and standard deviation is understated.
C. Average return is understated and standard deviation is overstated.
