● 假设某磁盘的每个磁道划分成9个物理块,每块存放1个逻辑记录。逻辑记录R0,R1,...,R8存放在同一个磁道上,记录的安排顺序如下表所示:
如果磁盘的旋转速度为27ms/周,磁头当前处在R0的开始处。若系统顺序处理这些记录,使用单缓冲区,每个记录处理时间为3ms,则处理这9个记录的最长时间为 (27) 。
(27)
● POP3服务默认的TCP 端口号是(70)。
(70)
● Observe that for the programmer, as for the chef, the urgency of the patron (顾客)may govern the scheduled completion of the task, but it cannot govern the actual completion. An omelette(煎鸡蛋), promised in two minutes, may appear to be progressing nicely. But when it has not set in two minutes, the customer has two choices—waits or eats it raw. Software customers have had (71) choices.
Now I do not think software (72) have less inherent courage and firmness than chefs, nor than other engineering managers. But false (73) to match the patron's desired date is much more common in our discipline than elsewhere in engineering. It is very (74) to make a vigorous, plausible, and job risking defense of an estimate that is derived by no quantitative method, supported by little data, and certified chiefly by the hunches of the managers.
Clearly two solutions are needed. We need to develop and publicize productivity figures, bug-incidence figures, estimating rules, and so on. The whole profession can only profit from (75) such data. Until estimating is on a sounder basis, individual managers will need to stiffen their backbones and defend their estimates with the assurance that their poor hunches are better than wish derived estimates.
(71)
● 以下 HTML代码中,创建指向邮箱地址的链接正确的是(69)。
(69)
● 联机分析处理(OLAP)与联机事务处理(OLTP)的区别是(65)。
(65)
● IP 地址块 222.125.80.128/26 包含了(66)个可用主机地址,其中最小地址是(67),最大地址是(68)。
(66)
● 对象关系数据库中,员工(工号,姓名,性别,联系电话)表中的联系电话为多值属性,则员工属于(62),在SQL99标准中可以使用(63)来实现。
(62)
● 不属于数据库访问接口的是(64)。
(64)
● 分布式数据库允许部分数据存在多个复本,而用户不必知道这些复本的存在,称为(61)。
(61)
● 关于分布式数据库,下列描述正确的是(60)。
(60)
● 某高校的管理系统中有学生关系为:学生(学号,姓名,性别,出生日期,班级),该关系的数据是在高考招生时从各省的考生信息库中导入的,来自同一省份的学生记录在物理上相邻存放,为适应高校对学生信息的大量事务处理是以班级为单位的应用需求,应采取的优化方案是(59)。
(59)
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