问题 填空题

关系规范化过程就是通过关系模式的分解,把低一级的关系模式分解为若干高一级的关系模式的过程;1NF,2NF,3NF,BCNF之间存在着______的关系。

答案

参考答案:BCNF[*]3NF[*]2NF[*]1NF

解析: 一级范式的关系模式的“问题”都是通过模式分解来解决的,通过分解若干高一级的关系模式,逐步实现规范化。高一级的范式一定属于低一级的范式,各范式之间的关系是一种全包含关系。

完形填空

III. 短文填词(共10小题,每小题1分,满分10分)

阅读下面短文,根据以下提示:1)汉语提示,2)首字母提示,3)语境提示,在每个空格内填人一个适当的英语单词,并将该词完整地写在右边相对应的横线上。所填单词要求意义准确,拼写正确。

An American bestseller has been popular among the students in our      

school ______(最近). It is so inspiring that I would like to recommend                  1. _________      

it to you. This book, Chicken Soup for the Soul, w______ by Jack                      2. _________      

Canfield, first appeared _______1993 and soon became a bestseller.               3. _________      

It will surely inspire readers of all ______(年龄). It has been put into                        4. _________      

many languages, spreading love to all over the world. B_________, an English              5. _________      

version is of g_________help to us English learners as it will help improve             6. _________      

our English. It costs 64 yuan. _________you can get it for 54.4 yuan through         7. _________      

online shopping, which will _________ (节省) you 9.6yuan. You can order        8. _________      

it at www.dangdang.com, and g_________the book within one week after                     9. _________       

your payment. For more_________please visit the website.                                          10. _________     

填空题