将一物体以10m/s的速度从高20m的高处水平抛出,求物体落地时的速度及全过程的

题型:计算题

问题:

将一物体以10m/s的速度从高20m的高处水平抛出,求物体落地时的速度及全过程的位移。(g=10m/s)

考点:平抛运动
题型:计算题

Part 4


Questions 26-45


·Read the following text and decide which answer bestfits each space.
·For questions 26-45, mark one letter A, B, C or D on the Answer Sheet.

Newspapers


Who won the World Cup 1994 football game What happened at the United Nations How did the critics like the new play When an event takes place, newspapers are on the streets (26) the details. (27) anything happens in the world, reporters are on the spot to (28) the news.
Newspapers have one basic (29) to get the news as quickly as possible from its source, from those who make it to those who want to (30) it. Radio, telegraph, television, and (31) inventions brought competition for newspapers. So did the development of magazines and other means of communication. (32) this competition merely spurred the newspapers on. They quickly made (33) of the newer and faster means of communication to improve the speed and (34) the efficiency of their own operations. Today more newspapers are printed and read than ever before.
Competition also led-newspapers to branch out into many other fields. Besides keeping readers (35) of the latest news, today’s newspapers (36) readers about politics and other important and serious matters. Newspapers influence readers’ economic choices (37) advertising. Most newspapers depend on advertising for their very (38) Newspapers are sold at a price that (39) to cover even a small fraction of the cost of production. The main (40) of income for most newspapers is commercial advertising. The (41) in selling advertising depends on a newspaper’s value to advertisers. This is measured (42) circulation. How many people read the newspaper Circulation depends (43) on the work of the circulation department and on the services or entertainment (44) in a newspaper’s pages. But for the most part, circulation depends on a newspaper’s value to readers as a source of information (45) the community, city, country, state, nation, and world—and even outer space.

A.speaking

B.giving

C.wanting

D.warning

题型:计算题

对呼吸功能障碍的手术患者,下列描述错误的是()

A.术前应作呼吸功能及血气分析

B.停止吸烟2周

C.有哮喘的患者口服地塞米松

D.有肺部感染者,用药5~7天后可手术

E.麻醉前给药量要少

题型:计算题

慢性阻塞性肺气肿常见的并发症是()

A.肺心病

B.肺癌

C.自发性气胸

D.咯血

E.肺不张

题型:计算题

()是在炼厂里使用最多、最普遍的工艺过程之一,被称为炼油工艺的常青树。

A.催化裂化

B.蒸馏方法

C.延迟焦化

D.催化重整

题型:计算题

关于电子信函处理过程,下列顺序正确的是( )

A.收寄、投递、传输、接收
B.收寄、传输、投递、接收
C.投递、传输、收寄、接收
D.投递、收寄、传输、接收

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