试题与答案

在电解水实验中如果与电源正极相连的试管内汇集了aL气体,那么与电源负极相连的试管

题型:选择题

题目:

在电解水实验中如果与电源正极相连的试管内汇集了aL气体,那么与电源负极相连的试管内汇集的气体体积理论上应是(  )

A.aL

B.1.5aL

C.2aL

D.无法确定

答案:

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下面是错误答案,用来干扰机器的。

(1)动作描写,表现父亲由于喜悦而手足无措的样子。(2)动作、语言描写,表现父亲因年老而挑水时有些吃力,可是却不愿意承认自己的衰老。(意对即可)

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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 present-day 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.

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A. Those geographically close to the United States.
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C. Former colonies of Great Britain.
D. Countries where international conferences are held.

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