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问题 单项选择题 A3/A4型题

男性，38岁，呕咖啡样物500ml，黑便2次伴晕厥入院，既往有十二指肠球部溃疡史

为了确诊，首选的检查方法是（）

A.急诊胃镜

B.肝功能

C.血常规

D.腹部超声

E.腹部平片

答案

参考答案：A

问答题

简述英国小学教育目标。
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单项选择题

An analyst does research about expected return and expect standard deviation of return from investment portfolio. Two assets have the same expected return and the same expected standard deviation of returns. The correlation coefficient of returns between the two assets is expected to be +0.6. Which of the following statements best describes the standard deviation of a portfolio composed of those two assets
If the two assets are combined to form a portfolio, the expected standard deviation of that portfolio will be:（）

A. the same as the expected standard deviation of returns for each asset because the correlation coefficient of returns is positive.

B. less than the expected standard deviation of returns for each asset because the correlation coefficient of returns is less than +1.0.

C. unaffected by the portfolio weights used for each of the two assets because the assets have the same expected return and the same expected standard deviation of returns.
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