下列关于视图与基本表的对比正确的是______。A.视图的定义功能强于基本表 B.视

题型:单项选择题

问题:

下列关于视图与基本表的对比正确的是______。

A.视图的定义功能强于基本表

B.视图的操作功能强于基本表

C.视图的数据控制功能强于基本表

D.上面提到的3种功能二者均相当

考点:计算机等级考试数据库技术数据库系统基本原理(二)
题型:单项选择题
等差数列{an}中,前三项分别为x,2x,5x-4,前n项和为Sn,且Sk=72.
(1)求x和k的值;
(2)求Tn=
1
S1
+
1
S2
+
1
S3
+…+
1
Sn
题型:单项选择题

啤酒内溶有二氧化碳(C02),瓶内酒面上的空间也充满二氧化碳,这些二氧化碳的气压比外界气压大。夏天,我们常看到刚掀开的冷冻啤酒瓶口会冒出雾气。下面一段话是对此现象的解释,其中有一部分是错误的,请你在错误的句子下面划线,并在划线下方改正。   

当掀开瓶口时,瓶内的二氧化碳就突然向外膨胀,也就是对外界做功,这时,它的内能突然减少,故温度降低。由于温度降低,二氧化碳气体发生液化变成液体,就是我们看到的雾气。

题型:单项选择题
An increase in students applying to study economics at university is being attributed to the global economic crisis awakening a public  36 for knowledge about how the financial system  37  .
Applications for degree courses beginning this autumn were up by 15% this January,  38 UCAS, the Universities and Colleges Admissions Service. A spokesman for the Royal Economic Society said applications to do economics at A-level were  39 up.
Professor John Beath, the president of the society, and a  40 lecturer at St Andrews University, said his first-year lectures—which are open to students from all departments—were  41 crowds of 400, rather than the  42 250.
“There are a large number of students who are not economics  43 who would like to learn something about it. One of the things I have done this year is to  44  my teaching to contemporary events in a way that one hasn’t  45 done.” He added.
University applications  46 7% last year. But there were rises  47  average in several subjects. Nursing saw a 15% jump, with people’s renewed  48 in careers in the public sector, which are seen as more secure in economic crisis.
A  49 study showed almost two thirds of parents believed schools should do more to teach pupils about financial  50  and almost half said their children had asked them what was  51 , although a minority of parents felt they did not understand it themselves well enough to explain.
Zack Hocking, the head of Child Trust Funds, said: “It’s possible that one good thing to arise from the  52 will be a generation that’s financially  53 and better equipped to  54  their money through times of economic  55 .”
小题1:
A.concernB.thirst C.sense D.taste
小题2:
A.worksB.performsC.servesD.affects
小题3:
A.in terms ofB.according toC.on account ofD.in spite of
小题4:
A.yet B.once C.alsoD.still
小题5:
A.outstandingB.inspiringC.convincing D.leading
小题6:
A.catchingB.appealingC.drawingD.covering
小题7:
A.usualB.regularC. averageD.common
小题8:
A.majorsB.interestsC.preferencesD.standards
小题9:
A.attachB.adaptC.approachD.relate
小题10:
A.generallyB.frequentlyC.traditionallyD.originally
小题11:
A.raisedB.roseC.fellD.struck
小题12:
A.by B.inC.overD.above
小题13:
A.effectB.focus C.interestD.benefit
小题14:
A.recentB.lateC.presentD.unique
小题15:
A.mattersB.affairsC. eventsD.issues
小题16:
A.taking upB.going onC.calling upD.keeping on
小题17:
A.overturnB.downturnC.breakthroughD.breakout
小题18:
A.clevererB.smarterC.brighterD.wiser
小题19:
A.struggltB.measureC.manageD.earn
小题20:
A.stabilityB.puzzleC.uncertaintyD.recovery
题型:单项选择题

根据《公路工程国内招投标文件范本》的相关规定,投标人的投标文件包括()

A.投标担保

B.授权书

C.联合体协议书

D.施工组织设计

E.选择方案及其报价

题型:单项选择题

试述宋元时期的瓷窑窑系及其特点?

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