问题 单项选择题

选用超声耦合剂错误的是

A.耦合剂越厚越好
B.应满足阻抗匹配条件
C.排除空气,增加透声性
D.让超声尽量多进入人体
E.特性阻抗接近人体(软组织)的特性阻抗

答案

参考答案:A

解析: 耦合剂是在超声波检查时,涂抹在要检查局部身体的表面物质,其作用是用来排除探头和被测物之间的空气,使超声波能有效地传入达到检测目的,其次是使皮肤与探头匹配层之间声阻得到过渡及耦合,第三是有利于探头移动。

完形填空

II 语言知识及应用(共两节,满分35分)

第一节完形填空(共10小题;每小题2分,满分20分)

阅读下面短文,掌握其大意,然后从21~30各题所给的A、B、C和D项中,选出最佳选项,并在答题卡上将该项涂黑。

Edinburgh is the capital city of Scotland (since 1437) as well as one of the biggest and most important cities in the country, the seventh biggest in the United Kingdom. The ___21___ of the city is around half a million. It lies in the southeast of ___22___. As the capital city it is also the seat of the Scottish Parliament (created in 1999). It is the second most ___23___ city in the United Kingdom after London, with 13 million visitors a year.

The ___24___ of Edinburgh is 100 square miles (259 square kilometers). The historical centre of the city is divided into two main parts, the Old Town and the New Town. They are ___25___ Princes Street Gardens. Both districts were ___26___ as a UNESCO World Heritage Site in 1995.

Edinburgh is quite famous for its annual Edinburgh Festival held four weeks from early August.

Edinburgh has been connected with many___27___people through its whole history. Famous authors of the city ___28___Sir Arthur Conan Doyle, the ___29___ of Sherlock Holmes, or nowadays J. K. Rowling, the author of Harry Potter. As far as the __30__ is concerned, the most famous people connected with Edinburgh are Charles Darwin (the biologist), Alexander Graham Bell (the telephone pioneer), and so on.

21. A. people         B. number      C. area           D. population

22. A. England              B. Britain              C. Wales         D. Scotland

23. A. travelled    B. visited        C. seen           D. explored                                                   

24. A. land            B. amount      C. area      D. boundary                                                   

25. A. separated by B. divided into       C. divided by  D. separated into                                            

26. A. regarded     B. thought      C. listed      D. treated

27. A. great         B. historical    C. famous      D. intelligent

28. A. include      B. contain   C. have          D. are   

29. A. author         B. discoverer  C. director      D. creator

30. A. science      B. biology   C. art             D. literature

判断题