首页
普通专升本
成人高考
学位英语
在线刷题
最近学习
最近学习课程
最强大脑 · 3天挑战极限记...
副标题副标题副标题副
最强大脑 · 3天挑战极限记...
副标题副标题副标题副
您现在位置：
模拟考场
>
湖北自学考试
>
公共课
>
管理系统中计算机应用
>
浏览试题
[单选题]
某E-R图中有“课程”实体A，“学生”实体B。实体A和实体B之间存在“选课”联系(m:n)，转换为关系模型后，“选课”关系的码应该是
A
A实体的码
B
B实体的码
C
A、B实体码的组合
D
A或者B实体的码
收藏
查看答案
参考答案
试题答案：
C
答案解释：
相关题目
在U/C矩阵中，每个功能必须产生或者使用数据类，这是U/C矩阵的
下列关于SQL语言使用方式的说法中，正确的是（ ）
影响输出方式选择的因素一个方面是各种输出设备，以下选项不是输出设备的是 （ ）
系统测试的目的是（ ）
23．系统开发过程中，首先要完成
5．无线电广播的通信方式是
14．最适合开发演示系统、部分功能系统、缩微系统的方法是
视图是一种 （ ）
热门试题
1.
什么是音位？划分音位的主要原则是什么？举例说明。
2.
22.There is no doubt that new technologies will also play an important role in language teaching in the twenty-first century. Indeed, the use of technology in foreign language learning has constituted another important revolutionary movement in our discipline (学科）in the last half of the twentieth century. Although it has clearly not been a methodological revolution，technological innovation has played an important role in the recent history of language teaching and is bound to have a profound effect on the way that languages are taught in the future. Beginning with the introduction of filmstrips, audiotapes, and language labs in “direct method” and “audiolingual” classroom over forty years ago, technological innovation has moved from the increased use of cassette tapes, videotapes, and overhead projectors and cameras in the past several decades to the introduction of CD-ROMs and the Internet in the 1990s. The possibilities for computer-enhanced language teaching have most recently been explored in distance education programs as well as in the use of local area networks, computer-assisted reading programs, and web-based classroom activities.Though the use of technology is nothing new in foreign language teaching, its exact role in the curriculum is still being assessed and questioned, particularly in light of the rapidly changing nature of technological aids to instruction. Rather than seeing technology as just another ancillary (助手） to be added to our teaching devices, we need to evaluate its potential for enhancing classroom learning as well as for facilitating (使……便利）student-centered, independent learning outside the classroom. In using technological aids and computer-mediated (计算机为中介的）materials in instruction, we also need to bear in mind the level of proficiency of our students and their ability to benefit from the materials that can be used for them. The use of authentic materials is going to be discussed in more detail in a later section of this chapter and in subsequent chapters.(10分)22.1 This passage is mainly about____.(2分)A. the role technology plays in foreign language learningB. the role technology plays in foreign language teachingC. the role computer plays in language learning and language teachingD. the role technology plays in foreign language learning and teaching
3.
五、补全对话：共5句；每句满分为3分，共15分。根据中文提示。把对话中缺少的内容写在线上。这些句子必须符合英语表达练习惯。打句号的地方，用陈述旬；打问号的地方，用疑问句。 提示：星期五晚上有音乐会，Chris得到两张票，打电话给Linda，问她是否有空一同前往，并约她音乐会后一起吃饭。Linda听了非常高兴，两人相约六点四十五分在人口处见面。
4.
Eggs, though rich in nourishments, have ______ of fat.
5.
27．幼儿园课程
热门试卷
成人高考专升本《政治》模拟试卷
去做题
已有3416做题
2020年湖北成人高考专升本政治模拟试题三
去做题
已有2213做题
成人高考专升本政治考试模拟试题及答案(1)
去做题
已有1898做题
湖北成考专升本政治真题（2021年）
去做题
已有1355做题
成人高考高起点语文考试高分突破试题及答案四
去做题
已有1194做题
