第6题: [单项选择]以下关于城域网建设方案特点的描述中,正确的是______。 Ⅰ.主干传输介质采用光纤 Ⅱ.交换结点采用基于IP交换的高速路由交换机或ATM交换机 Ⅲ.采用IS9/OSl 7层结构模型 Ⅳ.采用核心交换层、业务汇聚层与接入层3层模式 A. Ⅰ、Ⅱ、Ⅳ B. Ⅱ、Ⅲ C. Ⅰ、Ⅲ、Ⅳ D. Ⅰ、Ⅱ,Ⅲ 参考答案:A 答案解析:[解析] 本题考查点是城域网的主要技术特征。城域网MAN的规模和覆盖范围介于广域网和局域网之间,主要用于一个城市中企业、机关、学校等单位的局域网互连。目前,城域网建设方案有多种,其共同的特点包括:主干
A. Mr White was kind to them B. Mr White had a company C. Mr White often had a joke with them D. they liked to use computers 参考答案:A 答案解析:[考点] 细节题 [解析] 从文章第一段第三、四句He was nice to his employees and often had a joke with them. They liked
第12题: [单项选择]When can I go to see her
a. On weekends.
b. Whenever I want.
c. Anytime except weekends.
d. When she wants to see me. 参考答案:B 答案解析:[听力原文]
She said she didn’t like anyone to visit her on weekends. Then she went on to say that I cou