下列各组词语中读音完全正确的一项是（） A．旋涡（xuàn）缱绻（quǎn）干瘪

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.

以下说法正确的是

①通过置换反应可得到水或二氧化碳

②盐、碱和酸的组成中不一定都含有氧元素

③过氧化氢溶液中氢元素的质量分数一定大于1/17

④降温时，饱和溶液可能不析出晶体[ ]

A. ①②③④

B. ①③④

C. ①②

D. ③④

查处方（）

A.对科别、姓名、年龄

B.对药品性状、用法用量

C.对药名、剂型

D.对规格、数量

E.对临床诊断

水泵的扬程就是排水高度。

贸易条件