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
>
专业课
>
数据库系统原理
>
浏览试题
[单选题]
在ODBC分层体系结构中，用来处理ODBC函数的是（ ）
A
ODBC数据库应用程序
B
驱动程序管理器
C
DB驱动程序
D
数据源
收藏
查看答案
参考答案
试题答案：
C
答案解释：
相关题目
现要在学生表(STUDENT)中查找缺少性别(SEX)的学生学号(SNO)和课程号(SNAME)，下面SQL语句中WHERE子句的条件表达式应是：SNO，SNAME FROM STUDENT WHERE（）
30．X锁和S锁之间是如何协调的?
在对象联系图中，双箭头(→→)表示（）
数据库系统投入运行后，有哪些维护工作?
SQL中把完整性约束分成三大类：域约束、基本表约束和________。
42.设大学里教学数据库中有三个实体集。一是“课程”实体集，属性有课程号、课程名称；二是“教师”实体集，属性有教师工号、姓名、职称；三是“学生”实体集，属性有学号、姓名、性别、年龄、身份证号。设教师与课程之间有“主讲”联系，每位教师可主讲若干门课程，但每门课程只有一位教师主讲；教师与学生之间有“指导”联系，每位教师可指导若干学生，但每个学生只有一位指导教师；学生与课程之间有“选课”联系，每个学生可选修若干课程，每门课程可由若干学生选修，学生选修课程需要记录成绩。(1)试画出反映上述实体关系的E—R图(可以省略实体的属性)。(2)转换成关系模式，并指出每个关系模式的主键和外键(如果存在)。
用SQL语言创建视图V_EWC：视图包括职工工号、姓名、工资、公司编号、公司名称。
9．在MySQL中，用于实现交叉连接的关键字是
12.事务的并发执行不会破坏数据库的完整性，这个性质称为事务的
33．什么是T-SQL?
热门试题
1.
提示肺功能重度不全的最大通气量预计是( )
2.
21. The Crying GameAll normal human infants cry, although they vary a great deal in how much. A mysterious and still unexplained phenomenon is that crying tends to increase in the first few weeks of life, peak in the second or third month, and then decrease. Some babies in the United States cry so much during the peak period-often in excess of three hours a day-and seem so difficult to soothe that parents come to doubt their nurturing skills or begin to fear that their offspring (子孙后代) is suffering from a painful disease. Some mothers discontinue nursing and switch to bottle-feeding because they believe their breast milk is insufficiently nutritious and that their infants are always hungry. In extreme cases, the crying may provoke physical abuse, sometimes even precipitating (使发生) the infant's death.A look at another culture, the Kung San hunter-gatherers of southern Africa, provides us with an opportunity to see whether care-giving strategies have any effect on infant crying. Both the Kung San and Western infants escalate (使增强) their crying during the early weeks of life, with a similar peak at two or three months. A comparison of Dutch, American, and Kung San infants shows that the number of individual crying episodes are virtually identical. What differs is their length: Kung San infants cry about half as long as Western babies. This implies that care-giving can influence only some aspects of crying, such as duration.What is particularly striking about child-rearing among the Kung San is that infants are in constant contact with a caregiver; they are carried or held most of the time, are usually in an upright position, and are breast-fed about four times an hour for one to two minutes at a time. Furthermore, the mother almost always responds to the smallest cry or fret (烦躁) within ten seconds.I believe that crying was adaptive for our ancestors. As seen in the contemporary Kung San, crying probably elicited a quick response, and thus consisted of frequent but relatively short episodes. This pattern helped keep an adult close by to provide adequate nutrition as well as protection from predators. I have also argued that crying helped an infant forge a strong attachment with the mother and-because new pregnancies are delayed by the prolongation of frequent nursing-secure more of her care-giving resources.In the United States, where the threat of predation has receded (降低) and adequate nutrition is usually available even without breast-feeding, crying may be less adaptive. In any case, care-giving in the United States may be viewed as a cultural experiment in which the infant is relatively more separated-and separable-from the mother, both in terms of frequency of contact and actual distance.The Western strategy is advantageous when the mother's employment outside of the home and away from the baby is necessary to sustain family resources. But the trade-off seems to be an increase in the length of crying bouts. (490 words)(10分)21.1 Why does Western infants' crying tend to increase in the first few weeks of life and peak in the second or third month?____(2分)A. The infants suffer from a painful disease.B. Their parents lack nurturing skill.C. The reason is still unknown.D. Their parents abuse the infants physically.
3.
6. All of the following statements can correctly describe the Enlightenment Movement EXCEPT ______.
4.
It’s very important to maintain your current weight through exercise healthy eating.
5.
27．简述学前儿童体育的实施原则。
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
