下列关于反应限度的叙述不正确的是 [ ] A.反应限度是一种平衡状态,此时反应已

题型:选择题

问题:

下列关于反应限度的叙述不正确的是       [ ]

A.反应限度是一种平衡状态,此时反应已经停止

B.达到平衡状态时,正反应速率和逆反应速率相等

C.达到平衡状态时,反应物和生成物浓度都不再改变

D.不少反应都具有可逆性,只是有的程度小,有的程度大

考点:化学反应的限度
题型:选择题

已知U=R,A={x|0≤x<5},B={x|-2≤x<4},求A∩B,A∪B,A∩(CUB)

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网上银行的系统安全包括()。

A、操作系统安全

B、数据库系统安全

C、网络管理系统安全

D、通信系统安全

题型:选择题
完形填空(共20小题;每小题1.5分,满分30分)
阅读下面短文,从短文后所给各题的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。   
Jame’s New Bicycle
James shook his money box again. Nothing! He carefully   21  the coins that lay on the bed . $24. 52 was all that he had. The bicycle he wanted was at least $90!   22  on earth was he going to get the   23  of the money?
He knew that his friends all had bicycles. It was   24   to hang around with people when you were the only one without wheels. He thought about what he could do. There was no   25  asking his parents, for he knew they had no money to   26 .
There was only one way to get money, and that was to   27  it. He would have to find a job.   28  who would hire him and what could he do? He decided to ask Mr. Clay for advice ,who usually had   29  on most things.
“Well, you can start right here, ”said Mr. Clay. “My windows need cleaning and my car needs washing. ”
That was the   30 of  James’ s odd-job(零工) business. For three months he worked every day after finishing his homework. He was amazed by the   31   of jobs that people found for him to do.  He took dogs and babies for walks, cleared out cupboards, and mended books. He lost count of the   32   of cars he washed and windows he cleaned, but the  33   increased and he knew that he would soon have   34  for the bicycle he longed for.
The day   35  came when James counted his money and found $94.32. He   36   no time and went down to the shop to pick up the bicycle he wanted. He rode   37   home, looking forward to showing his new bicycle to his friends. It had been hard   38   for the money, but James knew that he valued his bicycle far more   39  he had bought it with his own money. He had   40   what he thought was impossible, and that was worth even than the bicycle.
小题1:
A.cleanedB.coveredC.countedD.checked
小题2:
A.HowB.WhyC.WhoD.What
小题3:
A.amountB.partC.sumD.rest
小题4:
A.braveB.hardC.smartD.unfair
小题5:
A.pointB.reasonC.resultD.right
小题6:
A.splitB.spendC.spareD.save
小题7:
A.borrowB.earnC.raiseD.collect
小题8:
A.OrB.SoC.ForD.But
小题9:
A.decisionsB.experienceC.opinionsD.knowledge
小题10:
A.beginningB.introductionC.requirementD.opening
小题11:
A.similarityB.qualityC.suitabilityD.variety
小题12:
A.brandB.numberC.sizeD.type
小题13:
A.effortB.pressureC.moneyD.trouble
小题14:
A.allB.enoughC.muchD.some
小题15:
A.finallyB.instantlyC.normallyD.regularly
小题16:
A.gaveB.leftC.tookD.wasted
小题17:
A.patientlyB.proudlyC.silentlyD.tiredly
小题18:
A.applyingB.askingC.lookingD.working
小题19:
A.sinceB.ifC.thanD.though
小题20:
A.deservedB.benefitedC.achievedD.learned
题型:选择题

改革开放以来,我国非公有制经济的成就令人瞩目,以平均2O%的增长速度蓬勃发展,占国民经济的比重进一步提高,全部非公有制经济可达GDP的3/4。

(1)请你列举出非公有制经济的两种形式。

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(2)根据材料说明,非公有制经济有着怎样的地位和作用?

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题型:选择题

焦油洗油质量变坏有何特征?对粗苯生产有何影响?

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