关系模型中的术语“元组”对应的概念在Access数据库中的是()
A.字段
B.索引
C.属性
D.记录
参考答案:D
单词拼写 。
根据下列句子及所给汉语注释,在横线上写出空缺处各单词的正确形式(每空只写一词)。
1. Do you speak any __________ (外国) languages?
2. Rebecca was the __________ (骄傲) of her family.
3. Will you stop __________ (打断) me when I'm talking?
4. David Beckham's __________ (国籍) is British.
5. The __________ (现代) history of Italy dates from 1860.
6. Bob's __________ (侄子) is a freshman at Harvard University.
7. Alice wanted to borrow Jack's computer, but he __________ (拒绝).
8. Her __________ (书架) are filled with books and photos.
9. What are you girls __________ (耳语) about?
10. Don't __________ (咳嗽) more than you can help.
吹扫时应将安全阀与管道连接处断开,并加盲板,以免脏物吹进阀底,使密封面磨损。