2022计算机四级冲刺密卷剖析(08.11)

1. [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

2. [单选题]外部设备按数据传输的方式可分为多种类型，通常键盘是哪一种类型的设备？

A. 块设备
B. 字符设备
C. 虚拟设备
D. 独占设备

查看答案&解析查看所有试题

本文链接：https://www.51ksbd.net/show/04yvzx.html