胃酸过多是常见的胃病。下面是甲、乙两种常见胃药的说明摘要。 甲:①白色结晶状粉末

题型:填空题

问题:

胃酸过多是常见的胃病。下面是甲、乙两种常见胃药的说明摘要。

甲:①白色结晶状粉末,受热可缓缓分解;

②能溶于水,水溶液呈弱碱性;灼烧时火焰为黄色;

③遇酸及酸性药物则产生二氧化碳;

④患者服用过量,可能引起胃胀气,甚至有引起胃溃疡穿孔的危险。

乙:①与胃酸是中和作用缓慢而持久,可维持3~4小时;

②凝胶本身覆盖于溃疡面上,具有保护作用;

③可溶于稀酸或氢氧化钠溶液中。

(1)请你推测,甲中含有的主要化学成份是____________(填化学式);乙中含有的主要化学成份是

____________(填化学式)。

(2)试写出甲中含有的主要化学成份引起胃胀气反应的离子方程式:____________________________。

(3)三硅酸镁Mg2Si3O8·nH2O也是常用胃药,被用来治疗胃溃疡,是因为该物质不溶于水,服用后中和胃酸作用持久。把三硅酸镁改写成氧化物形式为:_________________________。写出它中和胃酸(胃酸的主要成分是HCl)的化学方程式_______________________________。

(4)目前一种新型抗酸剂能迅速改善和缓解胃酸过多的症状,它主要由碳酸镁、氢氧化镁和氢氧化铝组成(说明:Mg(OH)2在高温下分解为MgO)。现按如下步骤测定药剂中三种主要成分的配比:

①取药剂样品,研磨后,加入50mL3.6 mol·L-1盐酸,正好完全反应并收集得到标准状况下224mL气体

②过滤,弃去其中不溶性物质(其余成分不参与反应)

③取②中滤液,加入足量的NaOH溶液后,过滤、洗涤、灼烧,所得固体2.4g。

则该药剂中三种主要成分的物质的量之比为n(MgCO3):n(Mg(OH)2):n(Al(OH)3)=_________。

考点:金属、非金属的有关计算碳酸氢钠氢氧化铝硅酸盐
题型:填空题

胡某,男,72岁。因发作性晕厥3次住院。心电图示:三度房室传导阻滞,心室率40次/分。首选治疗是()

A.临时心脏起搏

B.肾上腺素

C.利多卡因

D.胺碘酮

E.CPR

题型:填空题

甲、乙因钢材质量产生纠纷,乙申请某仲裁委员会仲裁,仲裁庭裁决驳回乙方请求,乙方认为仲裁庭的仲裁员王某对处理此案有受贿行为。依照我国《仲裁法》的规定,乙方可以申请( )。

A.请求法院撤销仲裁裁决

B.向高级人民法院起诉

C.向中级人民法院起诉

D.向上级仲裁委员会申诉

题型:填空题

阅读理解。

     Forget Twitter and Facebook, Google and the Kindle. Television is still the most influential medium around.

Indeed, for many of the poorest regions (地区) of the world, it remains the next big thing-finally becomes

globally available. And that is a good thing, because the TV revolution is changing lives for the better.

     Across the developing world, around 45% of families had a TV in 1995; by 2005 the number had climbed

above 60%. That is some way behind the U.S., where are more TVs than people, and where people now easily

get access to the Internet. Five million more families in sub-Saharan Africa will get a TV over the next five

years. In 2005, after the fall of the Taliban (塔利班), which had outlawed TV, 1 in 5 Afghans had one. The

global total is another 150 million by 2013-pushing the numbers to well beyond two thirds of families.

     Television's most powerful effect will be on the lives of women. In India, researchers Robert Jensen and

Emily Oster found that when TVs reached villages, women were more likely to go to the market without their

husbands' approval and less likely to want a boy rather than a girl. They were more likely to make decisions

over child health care. TV is also a powerful medium for adult education. In the Indian state of Gujarat,

Chitrageet is a popular show that plays Bollywood songs with words in Gujarati on the screen. Within six

months, viewers had made a small but significant (有意义的) improvement in their reading skills.

     Too much TV has been associated with violence, overweight and loneliness. However, TV is having a

positive influence on the lives of billions worldwide.

1. The underlined word "outlawed" in paragraph 2 probably means "_____". [ ]

A. allowed

B. banned

C. offered

D. refused

2. Which of the following is TRUE according to the passage?

A. Americans used to get access to the Internet easily.

B. The world's TV sets will total 150 million by 2013.

C. 45% of families in the developing countries had a TV in 2005.

D. Over two thirds of families in the world will have a TV by 2013.

3. The author intends to _____. [ ]

A. stress the advantages of TV to people's lives

B. persuade women to become more independent

C. encourage people to improve their reading skills

D. introduce the readers some websites such as Google

4. What would be the best title for the passage?[ ]

A. TV Will Rule the World

B. TV Will Disturb the World

C. TV Will Better the World

D. TV Will Remain in World

题型:填空题

细胞外液(ECF)约占体重的()。

A.20%

B.30%

C.40%

D.50%

E.60%

题型:填空题

异步电动机工作时,电源电压变化对电动机的正常工作()

A.有一定影响

B.影响很小

C.没有影响

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