【名词&注释】
延迟时间(delay time)、管理办法、网络服务(network service)、企业单位(enterprise units)、笔记本电脑(portable computer)、数据链路层(data link layer)、汉语拼音字母、格式化编码(format coding)、开发人员(developers)、强制性国家标准(mandatory national standards)
[单选题]计算机安全是指计算机系统的()受到保护。
A. 硬盘、软盘、光盘
B. 显示器、软盘、硬盘
C. 硬件、软件、数据
D. 主机、CPU、键盘
查看答案&解析
举一反三：
[单选题]
B． 方法查找
C． 类属类
D． 迭代器
A. 虚拟函数跳转表B． 方法查找
B. 类属类
C. 迭代器
[单选题]● 某磁盘磁头从一个磁道移至相邻磁道需要 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 （23） ms时间。（23）
A. 10200
B. 11000
C. 11200
D. 20200
[单选题]I/O接口是CPU与设备通信的桥梁，接口通信控制中经常使用异步通信方式，特点是(7)，在很多情况都使用同步通信，其特点是(8)．
A. 工作可靠，速度较快
B. 了作可靠，速度较慢
C. 控制简单，工作可靠
D. 控制复杂，工作可靠
[单选题]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 ome?lette (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.
A. 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.
B. (71)
C. no
D. the same
E. other
F. lots of
[单选题]●我国国家标准代号由大写汉语拼音字母构成，标准编号的后两位数字表示国家标准发布的 (14) 。(14)
A. 代号
B. 顺序号
C. 编号
D. 年号
[单选题]某企业单位根据应用需求需要在会议室部署无线AP。为了保证只允许处于该会议室内的笔记本电脑接入此无线AP，规划师的解决方案最有可能是 (67) 。
A. 在该无线AP上允许SSI
B. D广播，并对客户端的MA
C. C地址进行过滤
D. 在该无线AP上设置不广播SSI
E. D，并对客户端的IP地址进行过滤
F. 在该无线AP上允许SSI
G. D广播，并对客户端的IP地址进行过滤
H. 在该无线AP上设置不广播SSI
I. D，并对客户端的MA
J. C地址进行过滤
[单选题]下列选项中，(20)更好地描述了数据链路层的功能。
A. 给用户的应用提供网络服务
B. 定义了机械的、电气的、功能的和过程的规范
C. 处理差错报告、网络拓扑结构和流量控制机制
D. 完成数据表示和格式化编码(format coding)功能
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