问题 单项选择题

在数据库中能够惟一地标识一个元组的属性或属性的组合称为______.

A.记录

B.字段

C.域

D.关键字

答案

参考答案:D

解析:[知识点] 数据库基础知识/基本概念 [评析] 关键字是能够惟一地标识一个元组的属性或属性的组合。在Access'中,主关键字和候选关键字就起惟一标识一个元组的作用。

材料分析题

据2007年6月26日的《绵阳日报》报道:绵阳中学高三学生陈雁翎夺得了2007年的绵阳市高考文科状元。听说,升入高中后,陈雁翎的英语、数学成绩曾经让老师很失望。她就主动拿上试卷来到老师宿舍,请老师给补习。在老师的耐心辅导下,经过一段时间的恶补,陈雁翎的数学、英语成绩上升了很多。陈雁翎说:“老师的教育,师生的交往,使我在高考中获益非浅。”

结合上述材料,回答下列问题:

(1) 陈雁翎说“老师的教育,师生的交往,使我在高考中获益匪浅。”请谈谈你对这的话的理解。

                                                                                                                                                              

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                             

(2) 结合陈雁翎的事例,说一说如何共筑师生情感桥梁。

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                            

(3) 现代社会老师和学生之间应该是怎样的关系?

                                                                                                                                                             

                                                                                                                                                              

单项选择题