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问题 单项选择题

关于风险测定中的变异系数，下列计算公式正确的是( )。

A．变异系数CV=方差/预期收益率

B．变异系数CV=标准差/预期收益率

C．变异系数CV=预期收益率/方差

D．变异系数CV=预期收益率/标准差

答案

参考答案：B

解析： 变异系数(CV)描述的是获得单位的预期收益须承担的风险。变异系数越小。投资项目越优。变异系数CV=标准差/预期收益率=σi/E(Ri)。

问答题

Doc, a supplier of building materials, entered into the following transactions:(a) An agreement to sell some goods to a longstanding friend, Ed. The contractual document, however, actually stated that the contract was made with Ed’s company, Ed Ltd. Although the materials were delivered, they have not been paid for and Doc has learned that Ed Ltd has just gone into insolvent liquidation. (4 marks)(b) Doc had employed a salesman, Fitt, whose contract of employment contained a clause preventing him, Fitt, from approaching any of Doc’s clients for a period of two years after he had left Doc’s employment. Doc has found out that, on stopping working for him, Fitt has started working for a company, Gen Ltd, wholly owned by Fitt and his wife, and is approaching contacts he had made while working for Doc. (6 marks)Required:In the context of company law, advise Doc as to the legality and likely outcome of the above situations.Notes:– in (b) the legality of the restraint of trade clause in Fitt’s contract of employment may be assumed; and– the mark allocation is shown against each of the transactions above.(10 marks)
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单项选择题

3岁先天性心脏病患儿，平时无发绀，来院就诊。心导管检查：右心房血氧含量较上下腔静脉平均血氧含量高1.9Vol/dl，胸部X线检查：右房右室增大，肺动脉段突出。

此患儿的诊断是

A．房间隔缺损

B．室间隔缺损

C．动脉导管未闭

D．法洛四联症

E．肺动脉瓣狭窄
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