问题 多项选择题

下列哪些药物在鉴别中需应用p-萘酚试液()

A.对乙酰氨基酚

B.盐酸普鲁卡因

C.盐酸利多卡因

D.诺氟沙星

E.盐酸氯丙嗪

答案

参考答案:A, B

解析:芳香第一胺与β-萘酚试液反应称重氮化-偶合反应,用于鉴别芳香第一胺(即芳伯氨)。对乙酰氨基酚在盐酸酸性介质中受热,可水解生成芳香第一胺。取供试品约0.1g,加稀盐酸5ml,置水浴中加热40分钟,放冷;取0.5ml,滴加亚硝酸钠试液5滴。摇匀,用水3ml稀释后,加碱性β-萘酚试液2ml,振摇,即显红色。盐酸普鲁卡因具有芳伯氨基,在盐酸介质中与亚硝酸钠作用,生成重氮盐,重氮化盐进一步与β-萘酚偶合,生成有色偶氮合物。方法;取供试品约50mg,加稀盐酸1ml,必要时缓缓煮沸使溶解,放冷,加0.1mol/L亚硝酸钠溶液数滴,滴加碱性β-萘酚试液数滴,生成橙色或猩红色的沉淀。

多项选择题
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     How soon will it be before robots become so intelligent that will be able to do things, such as teaching

languages or looking after patients in hospital? Some experts believe this will happen within twenty years

while others disagree.

     One London company, UAS (Universal Automated Systems) has already developed machines that can be used as "home helps" for old people unable to look after themselves and who are living on their own or

in special homes.These machines can now do such things as cooking eggs and cleaning the floor, and the

company says that future models still accept simple voice instructions and be controlled by a " brain" that is the equivalent(当量) of the latest IBM microcomputer. The director of USA, Mr Henry Jeffries, believes

that in the next five to ten years companies will have developed even more sophisticated(复杂的) robots

for use in industry. By this time, it is likely that they will also have begun to sell new forms of these

machines into ordinary homes. Robots could do a wide range of household tasks, such as preparing meals, washing dishes, cleaning the house and so on. By then, the price of such machines may have come down to as little as $1 000.

     But Dr Sandra Lomax, who has done research into artificial(人工的) intelligence at Sussex University

and MIT ( Massachusetts Institute of Technology) believes we have a long way to go before we can

develop truly intelligent machines,

     "Preparing an omelette (煎蛋)  may seem easy enough. But suppose one of the eggs has gone bad,

even the most "intelligent" robot would probably still use it. If something slightly unusual needs

doing-something that requires even a little bit of ordinary human imagination, a robot is useless. They need programming for even the simplest of tasks and are not able to leam from experience. And teaching a

robot how to recognize a bad egg is far more difficult than teaching it to prepare the omelette the egg goes

into," she says.

1. Which of the following is the best title for this passage?      

A. Servants of the Future

B. How to Make Robots

C. Robots More Clever Than Man

D.The Robots and People

2. Dr Sandra Lomax thinks that .         .     

A. no robot will ever be able to prepare an omelette

B.a robot will soon be able to do unusual house- work people can't do

C. we can programme a robot to learn from experience

D. making an omelette is easier for a robot than recognizing a bad egg

3. Which of the following statements is TRUE according to this passage?      

A. All experts agree that there will soon be robots that can teach languages and look after patients in

     hospital.

B. Dr Sandra Lomax believes there are very great problems in developing intelligent robots.

C. Robots have taken an important part in people's daily life.

D. Such machines are already being sold into ordinary homes.

4. A London company called UAS has already developed a machine which _      .      

A. can teach languages and care for the patients in hospital

B. can help old people do certain jobs in the house

C.is controlled by microcomputer "brain"

D. can accept simple voice instructions

5. The director of UAS believes that in the next five to  ten years new forms of machines will         .      

A. be able to "think" with their own brains and do  anything with imagination

B. cost much less than $1 000

C. be used more in ordinary homes than in industry

D. do more housework