第4题: [单项选择]两表之间“临时性”联系称为关联,在两个表之间的关联已经建立的情况下,有关“关联”的正确叙述是______。 A. 建立关联的两个表一定在同一个数据库中 B. 两表之间“临时性”联系是建立在两表之间“永久性”联系的基础之上的 C. 当父表记录指针移动时,子表记录指针按一定的规则跟随移动 D. 当关闭父表时,子表自动被关闭 参考答案:C 答案解析:[解析] 只要在两个工作区中打开两个表(并不一定是同一数据库中的两个表),这两个表就有可能建立关联。建立关联的两个表并不一定是在同一个数据库中,更不一定存在着永久关系。当两个表建立关联后,移动主表的记
第18题: [单项选择]{{B}}Questions 11 to 18 are based on me conversation you have just heard.{{/B}} A. She could go with him after work. B. She left work early. C. She avoided having to work this weekend. D. She would rather work than go with the man. 参考答案:C 答案解析:[听力原文]
M: What are you going to do this weekend
W: I will try to get out of work.
Q: Whet does t