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问题 单项选择题

下列选项中，关于MIB的叙述正确的是( )。

A．MIB是一个概念上的数据库，实际网络中存在这样的库

B．MIB是一个概念上的数据库，实际网络中并不存在这样的库

C．MIB是一个实际上的数据库，实际网络中并不存在这样的库

D．MIB是一个实际上的数据库，但是实际网络中并不存在这样的库

答案

参考答案：B

解析： 管理信息库的定义：被管对象概念上的集合被称作管理信息库，所有相关的网络被管对象的信息都存放在MIB中，MIB的组成结构在SMI中定义。MIB仅是一个概念上的数据库，实际网络中并不存在这样的库。MIB库在网络管理中的应用使面向对象的程序设计实现开发一体化的网络管理应用系统成为可能。

单项选择题

与传统产业组织理论相比，新产业组织理论在研究方法和理论范式上都有所创新。在市场结构和行为的关系上，新产业组织理论重视对市场行为的研究，特别是企业策略行为对未来市场结构的影响，考察结构和行为间的“逆向因果关系”。“博弈论”是新产业组织理论的工具之一，主要用于分析（）。

A．完全信息条件下的企业静态竞争关系

B．不完全信息条件下的企业静态竞争关系

C．不完全信息条件下的企业动态竞争关系

D．完全信息条件下的企业动态竞争关系
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Most taxpayers have had enough income tax collected by their employers during the year. So they do not (36) any money. In fact, most Americans get some money back. Last year, the Internal Revenue Service returned at least some money to more than (37) Americans paying individual income tax.
The United States has what is called (38) . Tax rates increase as (39) increase. This year, people earning more than (40) are taxed at the highest rate.
Earnings above that amount are taxed at (41) . Earnings below that amount are taxed at lower rates.
Individuals who earn less than (42) pay no income tax. But they do pay (43) , Medicare and other taxes.
There are many different ways for people and businesses to reduce their (44) Most homeowners, for example, can reduce their taxes a little by reporting to the I.R.S. the interest they pay (45) . This is called a (46)
In 2004, personal income taxes provided the government with most of its money: (47) of the budget. Social security and other (48) taxes provided (49) . Other forms of income include (50) , money borrowed to (51) and special taxes on (52) .
But income from taxes did not provide enough to pay for government spending. The I.R.S. says the budget deficit for 2004 was about (53) dollars.
Preparing tax documents can be complex. The I.R.S. estimates that taxpayers need an average of about 13 hours to prepare tax documents. And that is just for the basic tax form. For business, the I.R.S. estimates an (54) needs more than 50 hours. This is why a lot of Americans pay (55) to complete their tax documents for them.
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