地球上陆地的面积约为148 000 000平方千米,用科学记数法表示为[ ] A

题型:选择题

问题:

地球上陆地的面积约为148 000 000平方千米,用科学记数法表示为[ ]

A.148×106平方千米

B.14.8×107平方千米

C.1.48×108平方千米

D.1.48×109平方千米

考点:科学记数法和有效数字
题型:选择题

如图所示,竖直圆筒内壁光滑,半径为R,上部侧面A处开有小孔,在小孔A的正下方h处亦开有与A大小相同的小孔B,小球从小孔A处沿切线方向水平射入筒内,使小球紧贴筒内壁运动,要使小球从B孔处飞出,小球进入A孔的最小速率v0为(   )

A.

B.

C.

D.

题型:选择题

葡萄胎临床表现错误的是()。

A.子宫大小于停经月份相符

B. * * 反复出血

C.妊娠20周后出现高血压水肿和蛋白尿

D.阵发性下腹隐痛

E.部分出现心动过速皮肤潮热和震颤

题型:选择题

国际上出现的具有代表性的创新过程模式有()。

A.技术推动模式

B.需求拉动模式

C.A-U过程创新模式

D.动态联盟模型

E.交互作用创新模式

题型:选择题

The number of speakers of English in Shakespeare's time is estimated to have been about five million. Today it is estimated that some 260 million people speak it as a native language, mainly in the United States, Canada, Great Britain, Ireland, South Africa, Australia and New Zealand. In addition to the standard varieties of English found in these areas, there are a great many regional and social varieties of the language as well as various levels of usage that are employed both in its spoken and written forms.

In fact, it is impossible to estimate the number of people in the world who have acquired an adequate working knowledge of English in addition to their own languages. The purpose for English learning and the situations in which such learning takes place are so varied that it is difficult to explain and still more difficult to judge what forms an adequate working knowledge for each situation.

The main reason for the widespread demand for English is its present­day importance as a world language. Besides serving the indefinite needs of its native speakers, English is a language in which some of important works in science, technology, and other fields are being produced, and not always by native speakers. It is widely used for such purposes as meteorological and airport communications, international conferences, and the spread of information over the radio and television networks of many nations. It is a language of wider communication for a number of developing countries, especially former British colonies. Many of these countries have multilingual populations and need a language for internal communication in such matters as government, commerce, industry, law and education as well as for international communication and for entrance to the scientific and technological developments in the West.

小题1:Which of the following statements is NOT true?

A.Some 260 million people in the world have an adequate working knowledge of English.

B.There are some 260 million native speakers of English in the world.

C.It is almost impossible to estimate the number of people with an adequate working knowledge of English.

D.People learn English for a variety of reasons.小题2:According to the passage, what is the main reason for the widespread use of English?

A.It was popular during Shakespeare's time.

B.It is used in former British colonies.

C.It serves the needs of its native speakers.

D.It is a world language that is used for international communication.小题3:What forms an adequate working knowledge of English?

A.The ability to read a newspaper.

B.It is difficult to judge because it differs for each situation.

C.Being a multilingual.

D.Being a native speaker.小题4:What type of developing countries would be most likely to use English?

A.Those geographically close to the United States.

B.Those interested in the culture of the United States.

C.Former colonies of Great Britain.

D.Countries where international conferences are held.

题型:选择题

不完全康复时()

A.致病因素已完全消失

B.功能、代谢和结构的障碍完全消失

C.基本病理变化尚未完全消失

D.机体的自稳调节完全恢复正常

E.劳动力完全恢复正常

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