第16题: [单项选择]Questions 11 to 18 are based on the passage you have just heard. A. He was afraid he might be kept too late. B. He would have something more important to do. C. He was not in the mood to attend the excursion. D. He had to make an appointment with a friend. 参考答案:A 答案解析:[听力原文] M: Hello, Susan, this is Jim. I’m afraid I have not been able to come to the excursion. I
第31题: [单项选择]正常排卵妇女,基础体温升高后应持续() A. 1~2天 B. 1周 C. 12~14天 D. 18天 E. 20天 参考答案:C
第32题: [单项选择]某磁盘磁头从一个磁道移至另一个磁道需要10ms。文件在磁盘上非连续存放,逻辑上相邻数据块的平均移动距离为10个磁道,每块的旋转延迟时间及传输时间分别为100ms和2ms,则读取一个100块的文件需要______ms的时间。 A. 10200 B. 11000 C. 11200 D. 20200 参考答案:D 答案解析:本题考查磁盘读取数据的基本原理。 通常要在磁盘上读取一个数据,首先需要寻道,即将磁头定位于目标磁道,然后通过磁盘的旋转,定位于要读取的信息之上,最后读取并传输数据。所以,读取每个数据需要耗费