肾小球旁细胞产生() A.促红细胞生成素 B.内皮素 C.心钠素 D.前列腺素 E.

题型:单项选择题 B1型题

问题:

肾小球旁细胞产生()

A.促红细胞生成素

B.内皮素

C.心钠素

D.前列腺素

E.肾素

考点:儿科住院医师内分泌系统疾病内分泌系统疾病题库
题型:单项选择题 B1型题

设数列{an}的各项都是正数,且对任意n∈N+,都有a13+a23+a33+…+an3=Sn2,其中Sn为数列{an}的前n项和.

(Ⅰ)求证:an2=2Sn-an

(Ⅱ)求数列{an}的通项公式;

(Ⅲ)设bn=3n+(-1)n-1λ•2an(λ为非零整数,n∈N*)试确定λ的值,使得对任意n∈N*,都有bn+1>bn成立.

题型:单项选择题 B1型题

在市场经济条件下,如何做一名优秀的营业员?

题型:单项选择题 B1型题

阅读理解。

     What is red but green, open but closed and old but new?

     The answer is: London's new double-decker (双层) buses.

     Red double-deckers are a symbol of the city. Their status was sealed (确定) in 2008 when one bus made

the longer-than-usual trip to Beijing to collect a special passenger: the Olympic Flame.

     On November 11, a life-size model of the new bus was shown to the media. The Guardian reported that

the new design shares some of the features of the much-missed double-decker Routemaster bus. The original

Routemaster was introduced in 1956 but December 2005 saw the end of the old bus's general service. It was

because the bus was difficult for some passengers to use and not environmentally friendly. But it can still be

seen on two heritage routes in the city.

     Its replacements-boxy, modern double-deckers-have failed to win Londoners' affection.

     London mayor Boris Johnson told the BBC that the new buses were "a combination of nostalgia (怀旧) and

the latest technology". "Standing on the back platform of this bus brings a sense of nostalgia but also shows

the best part of the latest technology and design, making this bus fit for the 21st Century," he said.

     The new bus also returns to the driver-and-conductor model-a key feature of the original version. It will be

quieter than the old type and have a platform offering passengers the traditional hop-on hop-off service.

     The first five new buses will be seen on the roads by early 2012.

1. Which of the following shows that red double-deckers are a symbol of London?

A. They have a long history and are seen everywhere in London.

B. They have nothing in common with the traditional Routemaster bus.

C. One such bus went from London to Beijing to collect the Olympic Flame.

D. They carried British athletes from London to attend the Beijing Olympics.

2. Which of the following is true of the original Routemaster?

A. The bus came into use in the 1960s.

B. The bus was banned because it was harmful to the environment.

C. Passengers didn't like the bus because it was slow.

D. Visitors to London cannot see such buses on the roads any more.

3. According to London mayor Boris Johnson, the new Routemaster _____.

A. has not been as well received as was expected

B. will be widely used in London in 2012

C. is the most environmentally friendly bus in the UK

D. combines the latest technology with key traditional features

4. What is the characteristic of the new red double-deckers?

A. The buses will make no noises.

B. The buses will have no conductors.

C. They will be equipped with air-conditioning.

D. The bus platform will offer passengers a traditional service.

题型:单项选择题 B1型题

食管癌X线造影的表现包括()

A.黏膜破坏

B.充盈缺损

C.管壁僵硬

D.造影剂通过受阻

E.扩张受限

题型:单项选择题 B1型题

在CO2气保焊焊接对水比较敏感的金属时,以下瓶内压力仍能使用的是()Mpa。

A.0.5

B.0.8

C.1.5

D.2.0

E.2.5

更多题库