下列有关数据库的描述,正确的是( )。A.数据库是一个DBF文件 B.数据库是一个 发布时间:2017-12-30 19:46 │ 来源:www.tikuol.com 题型:单项选择题 问题: 下列有关数据库的描述,正确的是( )。A.数据库是一个DBF文件B.数据库是一个关系C.数据库是一个结构化的数据集合D.数据库是一组文件
题型:单项选择题 ___________ and they will finish off the challenging job. A.In a weekB.A week later C.After a week D.Another week 查看答案
题型:单项选择题 It was only with the help of the local guide .[ ]A. was the mountain climber rescued B. that the mountain climber was rescuedC. when the mountain climber was rescued D. then the mountain climber was rescued 查看答案