如果采用的TR与心动周期吻合,且激发和采集落在舒张中后期,此时血液可表现为较高信号(

题型:单项选择题

问题:

如果采用的TR与心动周期吻合,且激发和采集落在舒张中后期,此时血液可表现为较高信号(SE序列),这种现象称之为()

A.流入增强效应

B.偶回波效应

C.舒张期假门控现象

D.流空效应

E.偶回波相位重聚

考点:医学三基(医技)放射学放射学题库
题型:单项选择题

Without proper planning, tourism can cause problems. For example, too many tourists can crowd public places that are also enjoyed by the local people of a country. If tourists create too much traffic, the local people become unhappy. They begin to dislike tourists and to treat them impolitely. They forget how much tourism can help the country’s economy(经济). It is important to think about the people of a destination country and how tourism affects them. Tourism should help a country keep the customs and beauty that attract tourists. Tourism should also advance(推进) the well-being (health and happiness) of local people.

Too much tourism can be a problem. If tourism grows too quickly, people must leave other jobs to work in the tourism industry. This means that other parts of the country’s economy can suffer.

On the other hand, if there is not enough tourism, people can lose jobs. Businesses can also lose money. It costs a lot of money to build large hotels, airports, air terminals, first-class roads and other support facilities needed by tourist attractions. For example, a major international-class tourism hotel can cost as much as 50 thousand dollars per room to build. If this room is not used most of the time, the owners of the hotel will lose money.

Building a hotel is just a beginning. There must be many support facilities as well, including roads to get to the hotel, electricity, sewers to handle waste, and water. All of these support facilities cost money. If they are not used because there are not enough tourists, jobs and money are lost.

小题1:What is probably the reason if local people dislike tourists?

A.Tourists come to enjoy the customs and beauty.

B.Local people lose jobs.

C.A lot of hotels are built.

D.Too many tourists cause traffic problems.小题2:What can we do to solve the problems caused by tourism?

A.Make plans properly

B.Help the country’s economy.

C.Build fewer hotels.

D.Advance the well-being of local people.小题3:If tourism grows too quickly, ___________.

A.businesses will lose money

B.other parts of the country’s economy will make more money

C.local people will be happier

D.more local people will work for tourists.小题4:Support facilities needed by tourist attractions includes ___________.

①public places ②hotels ③airports ④roads ⑤electricity  ⑥sewers

A.①②③④⑤

B.②③④⑤⑥

C.①②③⑤⑥

D.①③④⑤⑥小题5:If the writer wants to add Paragraph 5 to the passage, he may tell us ________.

A.whether people need to build more hotels

B.whether people need to plan tourism properly

C.how to deal with the problems above

D.how to prevent tourism growing too quickly

题型:单项选择题

简述伯兰兑斯《19世纪文学主潮》的成就和价值。

题型:单项选择题

The goods which have entered the territory, approved by the Customs as items for which no formalities are performed in the way of duty payment, and will be reshipped out of the territory after being stored, processed or assembled in the territory are defined, as ______.

A.bonded goods

B.through goods

C.transshipment goods

D.transit goods

题型:单项选择题

关于循环经济相关概念的说法,不正确的是______。

A.减量化,是指在生产、流通和消费等过程中减少资源消耗和废物产生
B.再利用,是指将废物直接作为产品或者经修复、翻新、再制造后继续作为产品使用
C.再利用,是指将废物的全部或者部分作为其他产品的部件予以使用
D.减量化,是指将废物直接作为原料进行利用或者对废物进行再生利用

题型:单项选择题

马克思主义和中国实际相结合的第二次飞跃是指()。

A.中 * * 党的成立

B.毛 * * 思想的产生

C.新中国的建立

D.邓 * * 理论的产生

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