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问题 单项选择题

在计算机局域网协议集中，数据链路层又可分为介质访问控制子层和 (43) ； LAN参考模型中服务访问点SAP的作用是 (44) ：局域网中数据传输的误码率较低，一般约在 (45) ；在LAN的介质访问方式中，争用属于 (46) ；以太网的介质访问控制方式与CSMA相比较，其所做的改进是 (47) 。

A．控制策略

B．延迟算法

C．等待时间

D．冲突检测

答案

参考答案：D

解析：

[分析]： 在计算机局域网协议集中，数据链路层又可分为介质访问控制子层和LLC子层； LAN参考模型中服务访问点SAP的作用是用来定义层间通信接口；局域网中数据传输的误码率一般约在10-8～10-11：在LAN的介质访问方式中，争用属于随机访问技术；以太网的介质访问控制方式与CSMA相比较，其所做的改进是冲突检测。

改错题

One day last week I went a walk in the country.                                       1.       

In the morning the weather was well and the sun was                                           2.       

shining;the sky was blue and there were no could.                                         3.       

Soon a cool wind started blown and black clouds                                          4.       

were covered the sun and then it started to rain.                                           5.       

There were no houses in sight,but I got very wet.                                          6.       

After a hour or so,I managed to catch a bus which                                        7.       

took me home.But when I arrived I was shivering                                         8.       

and I knew I had caught a bad cold.I must                                                   9.       

have taken my coat.I had nothing to do but to                                              10.       

stay at home and wait for a doctor.
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单项选择题

从满足的对象及内容上看，（）主要满足广大人民群众的多样性文化需求。

A.文化事业

B.文化事业和文化产业

C.文化建设

D.文化产业
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