不满足3范式的关系会出现的问题是()
A 无法存取
B 理解困难
C 运行缓慢
D 更新异常
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在SQL数据控制语言中权限回收语句的关键词是:()
A REVOKE
B RETURN
C RETRIEVE
D RECOVER
After a smoker finally quits smoking, he ______.
A. needs counseling for getting rid of smoking urges
B. is completely and happily satisfied with his success
C. has to adapt himself to a new life free from nicotine
D. comprehends what a nonsmoker really means to him
结构化主体在确定其控制方时将表决权或类似权利作为决定因素而设计的主体。()
可行性研究的主要内容不包括()
A 法律可行性
B 维护可行性
C 运行可行性
D 技术可行性
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