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主席台的座次一般是职务最高的居第一排正中，然后先左后右，由前至后的顺序依次排列。
The number of speakers of English in Shakespeare’s time is estimated (估计) 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 (足够的) 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.What forms an adequate working knowledge of English
（）通常是指门户或者商业网站的发布和管理系统，具有许多基于模板的优秀设计，可以加快网站开发速度和减少开发成本。
始终点调节式喷油泵柱塞头部的上下边的形状是（）。
对业主提供的镀锌管材还应做好哪些进场验收工作？
采用地下水作为给水水源，与地表水相比，具有（）优点。
履带式起重机当采用双机抬吊作业时，可选用起重性能不同的起重机进行。
正常人在30岁前，角膜内皮细胞的平均密度为每平方毫米（）
目前认为，可以肯定改善COPD、慢性肺心病患者长期预后的治疗措施是（）
躁狂发作病人的躯体症状最不可能是（）
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