【名词&注释】
候选关键字(candidate key)
[单选题]以下哪个命令用于测试网络连通？
A. telnet
B. nslookup
C. ping
D. ftp
查看答案&解析
举一反三：
[多选题]One of the greatest features of a home ______ is the ability to share one Internet connection simultaneously over two or more computers.
A. computer
B. device
C. network
D. Work
H.
[单选题]Document outputs are produced on(75) , devices that produce text or images on paper.
A. mouse and keyboard
B. scanners and plotters
C. display and scanners
D. printers and plotters
[单选题]从E-R模型向关系模型转换时，对于一个m：n联系转换为关系模式，该关系模式的关键字为(60)。
A. m端实体的关键字
B. n端实体的关键字
C. m端实体和n端实体的关键字组合
D. m端实体中不包含n端实体的关键字
本文链接：https://www.zhukaozhuanjia.com/download/y3k3ee.html
