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【单选题】
保护数据以防止未经授权或不合法的使用造成的数据泄露、更改或破坏,是指数据库的【 】A.
安全性控制
B.
完整性控制
C.
并发控制
D.
故障恢复
拍照语音搜题，微信中搜索"皮皮学"使用
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Johnny: Dear Tommy, why dont you come on holiday with us? Tommy: ______.
A.
That's very kind of you! I'd love to
B.
How dare you invite me? I won't go
C.
Yeah, thanks anyway
D.
Whether I'll go or not is not your business, ok?
【单选题】Why did Tommy’s parents send him to a catholic school? 阅读C.docx
A.
Because he could eat well there.
B.
Because he could earn more about nuns.
C.
Because his parents wanted him to do better in his math.
D.
Because his parents didn’t want him to learn math any more.
【单选题】Why did Mrs. White ask Tommy to write a report? Because______.
A.
she was angry with him
B.
she wanted the Whole (全部，完整的) class to follow his example
C.
she wanted him to learn the other side of truck driving
【简答题】三相异步电动机基本结构均由 和 两大部分组成。
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