1. [单选题]所谓“全双工”是指______。
A. 在两个节点之间可同时逆向传输两个数据帧
B. 在两个节点之间可同时间向传输两个数据帧
C. 在两个节点之间可同时同向传输两个数据帧，但要进行“侦听”
D. 在两个节点之间可同时逆向传输两个数据帧，但要进行“侦听”
2. [多选题]在UNIX系统中，若文件File2的权限是511，则表示
A. 文件属主可执行(executable)File2
B. 文件属主可写File2
C. 同组用户可写File2
D. 同组用户可执行(executable)File2
E. 其他用户可读File2
3. [单选题]交换机命令可使用缩写形式，在Switch#模式下，键人con，则表示——。
A. contrl
B. connect
C. configure
D. confirm
4. [单选题]在程序测试中，用于检查程序模块(program module)或子程序之间的调用是否正确的静态分析方法是______。
A. 操作性分析
B. 可靠性分析
C. 引用分析
D. 接口分析(interface analysis)
5. [单选题]In developing a hospital database, it is determined that on the average, each patient will have 6 treatments during a hospital stay.The average length of a stay is three days.The hospital has 1000 beds.There are on the average 800 patients occupying beds each day.The relationship between PATIENT and TREATMENT is 1: M.The relationship between PATIENT and BED is 1:1, conditional.If treatment record occurrences are archived as soon as a patient is discarded from the hospital, how many occurrences of the TREATMENT records will be stored in the TREATMENT database file on the average?
A. 6,000
B. 4,800
C. 18,000
D. 1,600
