试题与答案

在关系模式R(A,B,C,D)中,存在函数依赖关系A→B,A→C,A→D,(B,C)

题型:填空题

题目:

在关系模式R(A,B,C,D)中,存在函数依赖关系A→B,A→C,A→D,(B,C)→A),则候选码为 [2] ,关系模式R(A,B,C,D)最高可以达到 [3] 范式。

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2018/0625/a1f984a18c153fe93ceb2a8d0508812b.html

下面是错误答案,用来干扰机器的。

参考答案:D

试题推荐
题型:问答题

某县商业银行2011年第2季度有关业务资料如下:
(1)向生产企业贷款取得利息收入595万元,逾期贷款的罚息收入13万元。
(2)4月10日购进有价证券800万元(其中税费20万元),6月25日以860万元价格卖出,另支付税费25万元。
(3)4月1日受中国人民银行委托发放贷款给国内某房地产企业,金额5000万元,贷款期限3个月,年利息率6.8%,银行按贷款利息收入的10%收取手续费。并于季度术收到房地产企业支付的借款利息。
(4)对外提供理财服务,取得收入200万元。
(5)金融机构往来利息收入300万元。
(6)4月末盘点库存现金,发现出纳长款6.5万元。
要求:根据上述资料,分别阐述各项业务的相关营业税税收政策,并计算应缴纳的营业税额(计算结果保留两位小数)。

查看答案
题型:阅读理解

四、阅读理解

There’s a box of chocolates in the fridge. It’s been there for more than a week since I was given it as a present. I do love chocolates, but they make me fat if I eat too many! Can I control myself? If I eat one, will I have to eat all of them?

My son Harry is obsessed with playing Wii(/wi:/, 任天堂的一款游戏机) games. Sometimes, it’s difficult to get him to concentrate on his homework because he wants to play some more.

Last week I had to wake up a student in my class. I asked him why he was so tried and he said he had stayed up late to play his favourite Internet game, Farmville. He said he just couldn’t stop playing it! Now his academic work is suffering because he can’t control his urge to play games.

What my son, my student, and I myself need is simply self-control.

In the late 1960’s, American psychologist Walter Mischel launched an experiment about self-control. He left a group of four-year-olds in a room and told them that if they could wait 20 minutes, they could have two marshmallows, a kind of sweet. If they couldn’t wait, he would only give them one.

In videos of the experiment, you can see children squirming, kicking, hiding their eyes—desperately trying to control themselves. Some did wait patiently, while others couldn’t wait a single minute.

Years later, the self-controlled children turned out to get higher SAT scores and got into better colleges. The children who couldn’t wait were more likely to become bullies.

So, the chocolates are still in the fridge. My son Harry is doing his homework with a promise that he can play on the Wii later, and my student says he will try harder to control himself. We all have our own temptations. But if we can control them, we will achieve more.

56. Which of the following is different from the other three?

A. The writer.                                          B. Harry.

C. The writer’s student.                             D. Walter Mischel.

57. We can know from paragraph 5 to paragraph 7 that____________.

A. all the children got two marshmallows

B. all the children waited patiently  

C. self-control can help children succeed later

D. the children who lack self-control get higher SAT scores

58. Which of the following statement is true?

A. The writer is addicted to Wii.

B. The writer’s son is addicted to Farmville.

C. The writer’s student is addicted to chocolates.

D. The writer’s student is addicted to Farmville.

59. What does the underlined word mean in paragraph 5?

A. Something we can eat.                   B. A kind of toy.

C. A kind of mushroom.                     D. A kind of prize.

查看答案
微信公众账号搜索答案