当一个事务访问某个数据项时,以一定的方式锁住该数据项,从而限制其他事务对该数据项的访

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问题:

当一个事务访问某个数据项时,以一定的方式锁住该数据项,从而限制其他事务对该数据项的访问,这种方法称为______。

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

在国庆十周年电影展览中,共展出35部电影,其中大部分为1959年拍摄的,被称为“难忘的1959年”。你认为出现这种现象的主要原因是 [ ]

A.社会主义制度的建立

B.“双百”方针的提出

C.文艺为无产阶级专政服务

D.文艺界出现繁荣局面

题型:填空题

阅读课文,回答问题。

弯弯的月儿小小的船。

小小的船儿两头尖。

我在小小的船里坐,

只看见闪闪的星星蓝蓝的天。

(1)照样子写一写。

小小的 ___________ ___________ ___________ ___________

(2)课文把弯弯的月亮比做小小的船,把蓝天比做_____________________。

(3)圆圆的月亮像_____________________。

题型:填空题

I studied engineering after enjoying top marks, as high school came relatively easy. Then university life came!

I thought that I must have some learning disorder, as it seemed that everyone else was absorbing the material and making progress while to me it was an insurmountable(不能克服的) struggle. There were never enough hours in the day and weekend to attend the lectures, study the lessons and then do the assignment.

During my darkest hour I called home to speak to my father: “Dad, I don’t think I can handle this.” My father then said something, which cut through me like a knife: “There is no returning home. If you quit, then you are on your own.”

I hung up thinking what a terrible heartless thing to say. Then, I determined to somehow gut it out(坚持到底). There seemed to be no other choices available! Soon afterwards, I noticed a sigh posted in a campus common area stating: “Studying Skills” with a place & time to meet. It said that “there is help available”. I attended that meeting! I soon discovered there were several others in a similar situation and that everyone wanted to help each other get through this challenging first term. I soon found a study partner, who helped me a lot, and I was grateful to him for his kind help.

Yes, it was still a very challenging first year, but I found the needed strength and support to get through it. In fact my father has been helping me since then, but he has done it in another way. I know now in my heart that he did the very best help he could to help me fly. Thanks Dad for the push!

小题1:The story happened when the author _____.

A.just came to the new high school

B.was in his first term in university

C.was in the last year of high school

D.had been in the university for one year小题2:What was the author’s problem?

A.His father refused his request of returning home.

B.His father said some terrible words to him.

C.He found the course difficult to understand.

D.He could not understand his teachers.小题3:How did the author get through his challenge successfully?

A.He got help from his father in another way.

B.He changed the place and time for study.

C.He joined those who helped each other.

D.He paid more attention to study.小题4:Which of the following is the most suitable title for the text?

A.Differences between high school and university

B.My time in university

C.The importance of being strict with children

D.Push from my father

题型:填空题

分别阐述科学教育分类目标的内涵?

题型:填空题

商品经营者下列哪项做法,未违反《消费者权益保护法》规定的义务()。

A、告示:“本店货物一经售出,概不退换”

B、告示:“少儿须由家长陪同,方可进入本店”

C、告示:“本店所出售的小额商品,不予开具发票”

D、告示:“本店肉禽蛋类食品,随市场行情,价格常有变动”

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