如果多个事务在某个调度下的执行结果与这些事务在某个串行调度下的执行结果相同,则称这个

题型:填空题

问题:

如果多个事务在某个调度下的执行结果与这些事务在某个串行调度下的执行结果相同,则称这个调度为______调度。

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:填空题

阅读理解。

    Sally was a student. It was going to be her mother's birthday. She wanted to buy her a present that

would be nice and useful but not expensive. A week before her mother's birthday, she went shopping

after a quick and simple lunch. When she had been looking for half an hour, she found a shop that was

selling cheap umbrellas (伞), and decided to take a black one, since her mother had lost hers the month

before.

    She thought, "You could carry that when you are wearing clothes of any color." So she decided to

buy a lovely black umbrella and took it back to school with her until her classes had finished.

    On her way back home in the train that evening, she felt hungry because she had such a small lunch

that she went along to the buffet car (餐车) for another sandwich and cup of coffee. She had left the

black umbrella above her seat in the compartment (车厢), but when she got back, it had gone! When

she had left the compartment, there had been no other passengers (乘客) in it, but now there were three.

    Sally began to cry when she saw that the umbrella was no longer there. The other passengers felt very

sorry for her and asked what the matter was. She told them that the black umbrella she had bought for

her mother was gone, and that she had to get out at the next station. After the three other passengers

heard it, they asked her for her mother's address so that they could sent the umbrella to her if someone

had taken it by mistake and brought it back after Sally had got out of the train.

    The next week, Sally heard from her mother. It said, "Thank you very much for your lovely presents,

but why did you send me three black umbrellas?"

1. Which of the following is the best for the sentence "You could carry that when you are wearing clothes

    of any color?" [ ]

A. You can carry it when you are wearing any clothes.

B. Any color of your clothes will be all right.

C. The umbrella will be OK for your clothes in any colors.

D. You can take any clothes that you like to wear.

2. What does the story infer (推断)? [ ]

A. Her mother would write to her if she didn't receive the presents.

B. The three umbrella were sent by the girl.

C. Only four people had ever been to the compartment.

D. Nobody brought the umbrella back.

3. How many umbrellas did Sally's mother get at last?[ ]

A. No.

B. Only one.

C. Three.

D. Four.

4. The best name of the story is ______. [ ]

A. A Lucky Girl

B. The Missing Umbrella

C. A Happy Mother

D. Mother's Present

5. What does the writer want to tell us? [ ]

A. You should take care of your things when you are traveling.

B. Show your love to others, and they will bring you love.

C. Children should often come back to see their parents.

D. It's no use crying when you are in trouble.

题型:填空题

已知函数y=(m+2)x-2,要使函数值y随x的增大而增大,则m的取值范围是[ ]

A.m≥-2

B.m>-2

C.m≤-2

D.m<-2

题型:填空题

硝酸酯类与β受体阻断药联合应用抗心绞痛的药理依据是

A.作用机制不同产生协同作用

B.消除反射性心率加快

C.降低室壁肌张力

D.缩短射血时间

E.以上都是

题型:填空题

古代瓯江治理最早始于三国时代,勤劳的先民在好溪上游修建了(),成为流域内最古老的水利工程。

A.通济堰

B.广济堰

C.古方塘

D.湘湖

题型:填空题

3.答题文体不限,字数要求不少于500字。

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