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问题 多项选择题

预测分析环境影响时应尽量选用通用、成熟、简便并能满足准确度要求的方法。一般采用( )进行预测。

A．数学模型法

B．物理模型法

C．类比调查法

D．专业判断法

E．市场价值法

答案

参考答案：A,B,C,D

多项选择题

折现率中的风险报酬率的估测方法包括()。

A.风险累加法

B.β系数法

C.成新率法

D.加权平均法

E.因素调整法
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单项选择题

Melissa and LoveLetter made use of the trust that exists between friends or colleagues. Imagine receiving an （71） from a friend who asks you to open it. This is what happens with Melissa and several other similar email （72） . Upon running, such worms usually proceed to send themselves out to email addresses from the victim’s address book, previous emails, web pages （73） .As administrators seek to block dangerous email attachments through the recognition of well-known （74） , virus writers use other extensions to circumvent such protection. Executable (.exe) files are renamed to .bat and .cmd plus a whole list of other extensions and will still run and successfully infect target users.Frequently, hackers try to penetrate networks by sending an attachment that looks like a flash movie, which, while displaying some cute animation, simultaneously runs commands in the background to steal your passwords and give the （75） access to your network.

A．virtual

B．virus

C．worms

D．bacteria
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