单项选择题

下述()功能是数据库定义模块的基本功能。
Ⅰ.数据库模式定义
Ⅱ.数据库完整性定义
Ⅲ.数据库安全性定义
Ⅳ.存取路径定义

A.仅Ⅰ、Ⅱ和Ⅲ
B.仅Ⅰ、Ⅱ和Ⅳ
C.仅Ⅱ、Ⅲ和Ⅳ
D.都是

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单项选择题
在执行数据库访问命令之前,数据库管理系统DBMS首先需要执行下面()检查。 Ⅰ.语法检查 Ⅱ.用户存取权限检查 Ⅲ.语义检查

A.仅Ⅰ
B.仅Ⅱ
C.仅Ⅲ
D.Ⅰ、Ⅱ和Ⅲ

单项选择题
46()

A.A wireless microphone is attached to the dog’s collar,which sends information to the gadget held by the owner.
B.Nobody really knows how a dog feels.
C.This translated as“Don’t come this way”.
D.More customers are expected when the English version is launched this summer.
E.Now,the Japanese girl thinks she knows.
F.Each one of these emotions is then linked to a phrase like“Let’S play”.“Look at me”。or“Spend more time with me”.

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