The factory has produced ten thousand color TV sets this year, as ______ eight thousand last year.
A. for
B. to
C. against
D. from
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The main idea of this passage is ______.
A. Pageants
B. Costumes on the stage
Costumes for pageants
D. How to arrange a pageant
By saying "life has a way of throwing these curve balls at us", the author means ______.
A. life is full of miseries and misfortunes
B. things and people that you feel so comfortable with do not last for good and are destined to change
C. life is full of changes and these changes cannot be avoided
D. life is full of surprises
从E-R图导出关系模型时，如果两实体间的联系是m:n，下列说法中正确的______。
A. 将m方关键字和联系的属性纳入n方的属性中
B. 将n方关键字和联系的属性纳入m方的属性中
C. 在m方属性和n方的属性中均增加一个表示级别的属性
D. 增加一个关系表示联系，其中纳入m方和n方的关键字
聚集是一种______。
A. DDL
B. DML
C. 优化措施
D. 面向对象方法
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