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问题 单项选择题

在 ISO/OSI 参考模型中，网络层的主要功能是______。

A．组织两个会话进程之间的通信，并管理数据的交换

B．数据格式变换、数据加密与解密、数据压缩与恢复

C．路由选择、拥塞控制与网络互连

D．确定进程之间通信的性质，以满足用户的需要

答案

参考答案：C

解析：网络层的功能是在信源和信宿之间建立逻辑链路，为报文或报文分组的传递选择合适的路由以实现网络互联。为进行路由选择，要选择合适的路由选择算法，并针对网络情况实现拥塞控制。

填空题

用所给词的适当形式填空

1. Grace studies in Beijing _______ (internation)school.

2. There are many _______ (build) in this old city.

3. Our classroom is on the ______ (two) floor.

4. They want              ______ (play) games with us.

5. Students always practice ______ (dance) in the dancing room.

6. There ______ (be) some tea in the big box.

7. My friends are from different _______ (country) but we are friendly each other.

8. Are there ______ (some) trees in front of the classroom?

9. That tall building is ______ (we) teaching building.

10. —May I borrow your color pen?

      —Sorry, I don’t have one, Lucy may have one,You can ask ______ (she).
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单项选择题

A project management team is evaluating the causes that might contribute to unsatisfactory performance and quality. Which of the following statements is not true ？（）

A．Normal process variation is attributable to random causes and sometimes also called "white noise"

B．Special causes are easier to predict and handle than random causes(also called common causes)

C．Special causes are unusual events which are difficult to foresee and mostly produce outliers

D．A process can be optimized to limit the bandwidth of variations due to random causes
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