第(38)~(40) 题基于学生一课程数据库中的3个基本表: 学生信息表:s(sn

题型:单项选择题

问题:

第(38)~(40) 题基于学生一课程数据库中的3个基本表:
学生信息表:s(sno,sname,sex,age,dept)主码为sno
课程信息表:c(cno,cname,teacher)主码为cno
学生选课信息表:sc(sno,cno,grade)主码为(sno,cno)

实现“从学生信息表中找出性别为女的学生姓名”的SQL语句是

A.SELECT * FROM s

B.SELECT * FROM s WHERE sex=’女’

C.SELECT sname FROM s WHERE sex=’女’

D.SELECT * FROM s WHERE grade="

考点:计算机等级考试数据库技术三级数据库技术笔试
题型:单项选择题

阅读理解。

     Henry's family had a picnic (野餐) over the weekend. They asked their friends, Nancy and her

husband, to go with them. On Sunday morning, Henry's wife, Kate, got up early to prepare for the

picnic. She asked Henry to get some soft drinks. Henry told her that they were in the refrigerator

(电冰箱). Then Kate asked him to get the picnic basket ready. She also reminded(提醒)him that he

should put paper plates in it. At 10 o'clock in the morning Nancy called and told Henry that she would

like to bring something for the picnic. Kate called back and asked her to bring a bottle of wine. Nancy

and her husband arrived at noon. The two families went to a nearby park. A small river runs through the

park. There were tables and benches under the trees beside the river. The weather was cloudy but it

didn't rain. Everybody enjoyed the picnic and it was a very pleasant Sunday afternoon.

根据短文内容,选择正确答案。

1. Henry's family had a picnic with Nancy's family _______.

A. over the week                                              

B. on Saturday afternoon

C. on Sunday morning                                      

D. on Sunday afternoon

2. The soft drinks were _______.

A. on the table                                                  

B. in the kitchen          

C. in the refrigerator                                          

D. in the shop

3. Nancy was _______.

A. Henry's wife                                                

B. Kate's husband

C. Kate herself                                                  

D. Henry and Kate's friend

4. Who would bring a bottle of wine?

A. Kate's husband.        

B. Henry.                      

C. Kate herself.          

D. Nancy.

5. Where did the two families have a picnic?

A. A mountain nearby.                                        

B. A country nearby.

C. A park nearby.                                              

D. A city nearby.

题型:单项选择题

如图所示,有一光滑斜面倾角为θ,固定在水平面上,竖直挡板与斜面夹住一个质量为m光滑球,现使挡板以恒定的加速度a向右运动,则小球的加速度为(  )

A.a

B.acos θ

C.

D.asin θ

题型:单项选择题

写作的规定有几种要素()

A.1

B.2

C.3

D.4

题型:单项选择题

每日8时,观测降水量时,若有自然虹吸量,应更换(),然后在室内用量雨杯测量储水器内降水,并记载在该日降水量观测记录统计表中。

A.自记钟

B.储水器

C.承雨器

D.虹吸管

题型:单项选择题

概括南朝寺院经济的特点。

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