第3题: [单项选择]下面是有关计算机“可用性”的叙述,其中正确的是______。 A. 一台计算机具有较高的“可用性”,其含义是指它的MTBF比较低,MTTR比较高 B. 一台计算机具有较高的“可用性”,其含义是指它的MTBF比较高,MTTR比较低 C. 一台计算机具有较高的“可用性”,其含义是指它的MTBF和MTTR都比较高 D. 一台计算机具有较高的“可用性”,其含义是指它的MTBF和MTTR都比较低 参考答案:B 答案解析:[解析] 系统的可用性常常用平均无故障时间(MTBF)和平均故障修复时间(MTTR)来表示。如果MTBF的值很高,而MTTR的值很低,那么就认为该计算机具有高可用性。
第11题: [单项选择]Questions 11 to 18 are based on the conversation you have just heard. A. The bike is too old. B. The tires are not so good. C. The tires are broken. D. The bike is worthwhile. 参考答案:D 答案解析:[听力原文] M: How do you like this second-hand bike It was only thirty dollars. W: I would say th
第15题: [单项选择] Passage Two Questions 29 to 31 are based on the passage you have just heard. A. Lowering the pieces of the newspapers. B. Shortening their news stories. C. Adding variety to the content of the newspaper. D. To have more news. 参考答案:C 答案解析:[听力原文] What are editors and publishers doing to attract the non-readers