【简答题】Early one morning, more than a hundred years ago, an American inventor called Elias Howe finally fell asleep. He had been working all night on the design of a sewing machine but he had run into a very...
【单选题】目前,数据库领域采用的数据模型有层次模型、网状模型和关系模型,其中应用最广泛的是 ( )
【简答题】Early one morning, more than a hundred years ago, an American inventor called Elias Howe finally fell asleep. He had been working all night on the design of a sewing machine but he had run into a very...
【简答题】This course is for those who want to learn to type, as well as those who want to improve their typing. The course is not common. You are tested in the first class and begin practicing at one of eight ...
【单选题】目前,数据库领域采用的数据模型有层次模型、网状模型和关系模型,其中应用最广泛的是
【单选题】数据管理技术发展过程中, ( )是文件系统阶段的特点。