试题与答案

道岔人工加锁的补充规定,锁板由机务部门负责制作、安装和修理,其他加锁装置由使用部门设

题型:判断题

题目:

道岔人工加锁的补充规定,锁板由机务部门负责制作、安装和修理,其他加锁装置由使用部门设置。

答案:

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题型:情景交际

对话填空。请认真阅读下面对话,并根据各题所给首字母的提示,写出一个英语单词的完整、正确

形式、使对话通顺。

M=Mum

S=Sara

P=Peter

(When Sara came home from work, she found her mother in an anxious state)

S: What's wrong, Mum? You seem upset.

M: It's your (1)y______ sister Jill. She should have been here an hour ago.

S: Don't (2)w______, Mum! It's not all that late and she has probably not (3)r______ how late it is. I think

    she'll be here soon.

(Just then Sara's brother Peter came into the kitchen.)

P: What's up? Mum's on the phone and she seems as though she's going to cry.

S: It's Jill. She should have (4)r______ home by now and Mum's getting anxious.

P: You needn't feel so anxious Mum! You know what teenage girls are like. I'm (5)s______ she's all right.

M: I can't help but he concerned. I've just rung Lucy and she said Jill left her outside the cinema ages ago

    to get the bus home.

P: Well, the bus service isn't very frequent in the evenings. Perhaps she (6)m______ one and is waiting for 

    another. Have you tried (7)p______ her on her mobile?

M: Yes, but there's no reply. That made me even more worried. I think (8)s______ must have happened to 

     Jill. Do you think we should call the (9)P______?

S: Calm down, Mum! You'll make yourself ill. Perhaps she switched her mobile (10)o______ in the cinema 

    and forgot to switch it back on again. Or it may need to be charged.

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题型:问答题

A股票和B股票在5种不同经济状况下预期报酬率的概率分布如下表所示:

要求:

(1)分别计算A股票和B股票报酬率的期望值及其标准离差;

(2)计算A股票和B股票报酬率的协方差;

(3)根据2,计算A股票和B股票的相关系数;

(4)根据3,计算A股票和B股票在下列不同投资比例下投资组合的期望报酬率和标准离差;

(5)已知市场组合的平均收益率为12%,无风险收益率为4%,则A股票的β系数为多少说明其经济含义。

(6)根据5,如果A股票和B股票分别按WA=0.8,WB=0.2的比重组合,组合的必要报酬率为11%,则B股票的β系数为多少?

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