在E—R模型中,实体集的主键是指能唯一标识实体的属性或属性组。()
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Questions 16-17
Complete the notes below.
Use NO MORE THAN THREE WORDS for each answer.
【16】
Questions 27-28
Circle TWO letters A-F.
Which TWO facts are mentioned about Copenhagen?
A——live street theatre encouraged
B——30% of citizens walk to work
C——introduction of parking metres
D——annual reduction of parking spots
E——free city bicycles
F——free public transport
【27】
应该用________为每张幻灯片添加相同的对象。
Windows操作系统安装成功后,在“资源管理器”下查看文件目录默认的状态是“隐藏已知文件类型的扩展名”。进行以下操作:打开“资源管理器”→________,可以改变成显示文件扩展名。