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
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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
系统转换的方式包括:()
A 直接转换
B 间接转换
C 部分转换
D全部转换