An analyst compared the performance of a hedge fund index with the performance of a major stock index over the past eight years. She 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 Average return for the Standard deviation for the hedge fund indes hedge fund index（）

A. Understated Overstated

B. Overstated Understated

C. Overstated Overstated

交流不间断电源验收过程中应重点检查哪些项目（）

A.绝缘试验

B.输出波形失真度

C.充电装置性能试验

D.运行方式切换试验