皮皮学，免费搜题
登录
搜题
【单选题】
在关系代数中,从两个关系的笛卡儿积中选取它们属性间满足一定条件的元组的操作称为 。A.
并
B.
选择
C.
自然连接
D.
连接
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】Chaplin quit Britain for good in 1913 when he journeyed to America with a group of performers to do his comedy act on the stage, where talent scouts recruited him to work for Mack Sennett, the king of...
A.
永久地
B.
美好地
【简答题】阅读理解。 When we think of Hollywood. we think of films and famous film stars. They are parts of Hollywood's history. Today people make films in other places, too. Not all famous film stars live in Hollyw...
【单选题】Chaplin quit Britain for good in 1913 when he journeyed to America with a group of performers to do his comedy act on the stage, where talent scouts recruited him to work for Mack Sennett, the king of...
A.
明星
B.
星探
【简答题】金本位制下，决定汇率的基础是什么？
【简答题】阅读理解。 When we think of Hollywood (好莱坞), we think of films and famous film stars. They are part of Hollywood's history. Today people make films on other places too. Not all famous film stars live in Ho...
相关题目：
参考解析：
知识点：
题目纠错 0
发布
