关于2molCO2的叙述,正确的是 (相对原子质量 C—12 O—16) A.质

题型:选择题

问题:

关于2molCO2的叙述,正确的是 (相对原子质量 C—12  O—16)

A.质量为88g

B.摩尔质量为88g/mol

C.分子数为1.204×1024

D.常温下,体积为44.8L

考点:离子共存
题型:选择题

肾小球病变中炎症不明显的、最有代表性的是()。

A.微小病变肾病

B.膜性肾病

C.局灶节段性肾小球硬化

D.系膜毛细血管外增生性肾炎

E.系膜增殖性肾小球肾炎

题型:选择题

年老体弱、久病及妇女胎前产后便秘者应使用( )

A.温里药

B.补益药

C.峻下逐水药

D.润下药

E.攻下药

题型:选择题

如图所示,边界OA与OC之间分布有垂直纸面向里的匀强磁场,边界OA上有一粒子源S.某一时刻,从S平行于纸面向各个方向发射出大量带正电的同种粒子(不计粒子的重力及粒子间的相互作用),所有粒子的初速度大小相同,经过一段时间有大量粒子从边界OC射出磁场.已知∠AOC=60°从边界OC射出的粒子在磁场中运动的最长时间等于

T
2
 ( T为粒子在磁场中运动的周期),则从边界OC射出的粒子在磁场中运动的时间不可能为(  )

A.

T
8

B.

T
6

C.

T
4

D.

T
3

题型:选择题

The Pacific island nation of Nauru used to be a beautiful place.Now it is an ecological disaster area.Nauru’s heartbreaking story could have one good consequence — other countries might learn from its mistakes.

For thousands of years, Polynesian people lived in the remote island of Nauru, far from western civilization.The first European to arrive was John Fearn in 1798.He was the British captain of the Hunter, a whaling ship.He called the island Pleasant Island.

However, because it was very remote, Nauru had little communication with Europeans at first.The whaling ships and other traders began to visit, bringing guns and alcohol.These elements destroyed the social balance of the twelve family groups on the island.A ten-year civil war started, which reduced the population from 1,400 to 900.

Nauru’s real troubles began in 1899 when a British mining company discovered phosphate (磷酸盐)on the island.In fact, it found that the island of Nauru was nearly all phosphate, which was a very important fertilizer for farming.The company began mining the phosphate.

A phosphate mine is not a hole in the ground; it is a strip mine.When a company strip-mines, it removes the top layer of soil.Then it takes away the material it wants.Strip mining totally destroys the land.Gradually, the lovely island of Nauru started to look like the moon.

In 1968, Nauru became one of the richest countries in the world.Every year the government received millions and millions of dollars for its phosphate.

Unfortunately, the leaders invested the money unwisely and lost millions of dollars.In addition, they used millions more dollars for personal expenses.Soon people realized that they had a terrible problem — their phosphate was running out.Ninety percent of their island was destroyed and they had nothing.By 2000, Nauru was financially ruined.Experts say that it would take approximately $433,600,000 and more than 20 years to repair the island.This will probably never happen.

小题1:What might be the author’s purpose in writing the text?

A.To seek help for Nauru’s problems.

B.To tell a heartbreaking story of a war.

C.To show the importance of money

D.To give a warning to other countries小题2:What was Nauru like before the Europeans came?

A.Rich and powerful

B.Peaceful and attractive

C.Modern and open

D.Greedy and aggressive小题3:The ecological disaster in Nauru resulted from _______.

A.phosphate overmining      B soil pollution

C.farming activity             D.whale hunting

小题4:Which of the following was a cause of Nauru’s financial problem? 

A.Its phosphate mining cost much money

B.It spent too much repairing the island

C.Its leaders misused the money

D.It lost millions of dollars in the civil war.小题5:What can we learn about Nauru from the last paragraph?

A.The ecological damage is difficult to repair.

B.The leaders will take the experts’ words seriously.

C.The island was abandoned by the Nauruans

D.The phosphate mines were destroyed

题型:选择题

某企业打算采用差异化战略,该战略可以使企业产品较高价值增值.但受金融危机影响,全球购买力下降,市场需求下降,战略无法实施.该战略失效属于().

A.早期失效

B.偶然失效

C.晚期失效

D.以上均不正确

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