用作牙膏摩擦剂的轻质碳酸钙可以用矿石A来制备,某化学兴趣小组设计了2种转化流程,

题型:问答题

问题:

用作牙膏摩擦剂的轻质碳酸钙可以用矿石A来制备,某化学兴趣小组设计了2种转化流程,如下图所示.

已知:a.二氧化碳持续通入氢氧化钙溶液发生如下反应:CO2+Ca(OH)2═CaCO3↓+H2O,CaCO3+H2O+CO2═Ca(HCO32

b.碳酸氢钙微溶于水,微热易分Ca(HCO32═CaCO3↓+H2O+CO2↑;

c.生石灰与水充分反应后可得到颗粒非常细小的熟石灰浆.

试填空.

(1)小王主张用流程①、②、④和操作Ⅱ的设计,认为其工艺简单.请写出反应①和④的化学方程式:

①______;④______;操作Ⅱ包括______等工序.

(2)制轻质碳酸钙时,D为______(选填“悬浊液”或“溶液”或“乳浊液”),理由是:______.

(3)小李认为流程①、②、③和操作I比小王的主张更好,其理由是:______;操作I包括搅拌和微热等工序.

考点:石灰石的利用过滤化学实验方案设计和实验现象的分析化学反应方程式的书写文字表达式悬浊液、乳浊液
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中 * * 是一个具有凝聚力和向心力的伟大民族。电影《东归英雄传》讲述了清朝时期我国的一支少数民族不远万里、历经千险回归祖国的故事。这支少数民族民族是()

A.东突厥

B.蒙占族土尔扈特部

C.回族

D.吐蕃

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●●●                          

US Defence Secretary Donald Rumsfeld is likely to visit China at an “ appropriate” time this year, a senior Chinese military official said on Monday. Colonel Tu Qiming, director of the American and Oceanian Affairs Bureau of the Foreign Affairs Office at the National Defence Ministry, made the remark during Sino -US defence talks this week. This is the first ever “special defence policy dialogue” between the two defence ministries, according to the Chinese military.

●●●

FRANCES Agriculture Ministry has confirmed (证实) the first case of mad cow disease detected in a goat last Friday. The goat killed in 2002 tested positive for mad cow disease. It is the first case in the world of the fatal disease being found in an animal other than a bovine. The human form of mad cow disease causes brain - wasting, personality change, loss of body function, and ends in death. The European Commission has not advised any change in farming and consuming goats, said the French Ministry in a statement published last Friday.

●●●

MOBILE phone sales hit a new record in 2004, with some 684 million units sold around the world, the US research institute Strategy Analytics said on Thursday. The number represents an increase of 32 per cent over 2003, when 571 million units were sold. Strategy Analytics predicts a more modest rise of 8 per cent for this year, to 735 million. Finnish cellphone provider Nokia stayed out in front in 2004, with sales of 207.6 million units, giving it a market share of 30.4 per cent. Motorola moved to No 2, just ahead of the South Korean company Samsung.

●●●

SIX male penguins (雄企鹅) at a German zoo are proving stubbornly resistant to females brought in from Sweden to make them into breeding (繁殖). Of the ten male penguins at the zoo, six have formed into " homosexual" couples and have shown no interest in the females, making breeding an impossibility. So the zoo imported the four female penguins from Sweden last month, full of hope that the new arrivals could “turn” the males. But so far, the boys are remaining strictly with the boys.

小题1:How many countries are mentioned in the pieces of news?

A.Six.

B.Five.

C.Three.

D.Seven.小题2:From the fourth piece of news we know that          .

A.the scientists haven’t succeeded in doing their experiment

B.the scientists have successfully got six female penguins into breeding

C.the Sweden girls made the boys show interest in them

D.German boys don’t like Sweden boys小题3:Which of the following are the suitable headlines for the pieces of news?

A.a. US Defence Secretary Visit Likely

B.a. US Defence Secretary Visit Likely

b. France Confirms 'Mad Goat" Caseb. France Confirms ' Mad Goat" Case

c. Nokia Stays on Topc. Mobile Phone Sales

d. Male Penguins and Female Penguinsd. Birds of a Feather

C.a. Defence Policy Dialogue

D.a. Sino - US Talksb. Mad Goat Disease                        b. Mad Goat Case

c. Mobile Phone Sales                       c. Motorola' s Sales Reduced

d. Importing Female Penguins                 d. Boys and Girls

题型:问答题

导游语言是一种口头文学语言,因此,导游员必须注意语言的( )。

A.通俗性

B.科学性

C.知识性

D.生动性

E.艺术性

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给煤机的出力?

题型:问答题

良好的()是一种无形资产,是医院的一种潜在资源。

A、医院形象

B、医患关系

C、医护素质

D、以上均不是

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