问题 问答题 简答题

在进行填料塔和板式塔的选型时,什么情况可优先选择填料塔?

答案

参考答案:下列情况可考虑优先选用填料塔:

⑴离程度要求高的情况下,因某些新型填料具有很高的传质效率,故可采用新型填料以降低塔的高度;

⑵对于热敏性物料的蒸馏分离,因新型填料的持液量较小,压降小,故可优先选择真空操作下的填料塔。

⑶具有腐蚀性的物料,可选用填料塔,因为填料塔可采用非金属材料,如陶瓷、塑料等。

⑷容易发泡的物料,宜选用填料塔,因为在填料塔内,气相主要不以气泡形式通过液相,可减少发泡的危险,此外,填料还可以使泡沫破碎。

阅读理解

A dentist’s office may not be everyone’s idea of a perfect holiday destination.But a growing number of Europeans are travelling abroad for medical treatment to save money,or maybe to combine a visit to the doctor with some sightseeing,creating a potential but fast­growing market for traditional tour operators.

“It was simply cheaper for me to go to a dentist in Hungary,” said a 42­year­old physical therapist from Berlin.He chose the clinic near Budapest from an Internet advertisement,attracted by hundreds of euros in savings compared with the same treatment in Germany.He was happy to find when he got there that the clinic was clean,the staff qualified and the work thorough.

People travel abroad for medical treatment for various reasons:it’s cheaper,they face a long wait at home,or the treatment they want is not available in their own country.The British­based Medical Tourist Company refers about 100 patients a year to hospitals in India for treatments.And Chief Executive Premhar Shah reports rapid growth in demand from customers in Africa,where it can be harder to find well­equipped medical facilities for complex surgeries.

Some patients who have immigrated may prefer to return to be close to their families when they undergo surgery.“People will want to take the opportunity to seek treatment in places where they have relatives who might be able to look after them.I’m seeing that especially with younger people from eastern Europe,” said a professor at the University of Oxford.

For some,there is the attraction of free treatment abroad.British law­makers have called for tighter checks on patients arriving for treatment,out of concerns that foreign citizens are travelling to Britain to take advantage of the free service.

The global medical tourism market is believed to be worth $40 billion to $60 billion and growing at about 20 percent per year.

小题1:The 42­year­old physical therapist was satisfied with________in Hungary.

A.the price instead of the service

B.the service instead of the price

C.both the price and the service

D.neither the price nor the service小题2:How many reasons are mentioned to explain why people go abroad for medical treatment?

A.Four.      

B.Five.

C.Six. 

D.Seven.小题3:According to the article,________for medical treatment.

A.more Africans want to travel abroad

B.more Europeans want to travel to Africa

C.more Britons want to travel to India

D.no one would come to Great Britain小题4:Young people from eastern Europe return to their mother countries for surgery in order to________.

A.get cheaper medical service

B.be looked after by relatives

C.have better medical treatment

D.enjoy free medical treatment小题5:What does the article mainly talk about?

A.Overseas sightseeing. 

B.Hospital treatment.

C.Medical tourism. 

D.Travelers’ health problems.

名词解释