真核生物mRNA前体的加工过程不包括A.5'末端加帽 B.3'末端加多聚A尾 C.甲

题型:单项选择题

问题:

真核生物mRNA前体的加工过程不包括

A.5'末端加帽

B.3'末端加多聚A尾

C.甲基化修饰

D.磷酸化修饰

考点:普通考研西医综合西医综合
题型:单项选择题

患者女,59岁,因“颈内动脉瘤(直径8mm)”拟在全身麻醉下行动脉瘤夹闭术。病史及术前检查无其他系统性疾病。

术中术者要求控制性降压,以下不合适的是()。

A.MAP<60mmHg

B.加深麻醉

C.MAP<50mmHg

D.应用硝普钠

E.椎管内给予局部麻醉药

题型:单项选择题

对桥梁板式橡胶支座进行检验前,应将试样直接暴露在标准温度和湿度下停放 ( ),以使试样内外的温度一致。

A.24h

B.48h

C.72h

D.96h

题型:单项选择题

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

用某年全市的出生数和婴儿死亡数计算婴儿死亡率,这种方法属于()

A.参数估计

B.抽样研究

C.统计描述

D.统计推断

E.以上选项都不正确

题型:单项选择题

某个时间内某病的病例数/同期平均人口数×100%表示()。

A.发病率

B.患病率

C.罹患率

D.病死率

E.死亡率

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