皮皮学，免费搜题
登录
搜题
【单选题】
在一个关系模型中，对记录行进行筛选是（ ）运算A.
选择
B.
组合
C.
连接
D.
投影
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】一、单选题: 1 带鱼的脂肪含量是海洋鱼类中较高的,特别是体表银白色的物质含有脂肪的量是( )。 · A 、 15 ~ 20% · B 、 20 ~ 25% · C 、 25 ~ 30% · D 、 30 ~ 40%
A.
B
B.
C
C.
D
D.
A
【单选题】Question 6
A.
Having his wife killed.
B.
Killing his wife in the U.K.
C.
Being involved in a taxi accident.
D.
Hiring a crew of hit men.
【单选题】Question 6
A.
Because she doesn't want to spend too much money.
B.
Because most of the places have already been taken.
C.
Because there aren't many places to choose from in that area.
D.
Because all the new students are looking for accommodation.
【单选题】Question 6
A.
How college students pay for their education.
B.
How to handle problems of college loans.
C.
The disadvantages of college loans.
D.
Government financing in college education.
【单选题】Question 6
A.
There is a great variety of foods.
B.
There is a great variety of nutrients.
C.
It is difficult to make your choice of food.
D.
It is important to fit foods together properly.
【单选题】Question 6
A.
It can only drive in flat areas .
B.
It cannot go over 130 kilometers per hour .
C.
It has no gas pedals and steering wheels.
D.
It has no safety devices.
相关题目：
参考解析：
知识点：
题目纠错 0
发布
