问题 问答题 简答题

《声学声压法测定噪声源声功率级反射面上方近似自由场的工程法》(GB/T3767-1996)对测试环境的要求是什么?

答案

参考答案:

适用于该标准的测试环境为:

(1)提供一个反射面上方自由场的实验室;

(2)满足测试环境合适性评判标准和附录A(标准的附录)要求的室外平坦空地;

(3)混响场对测量表面上声压的影响小于声源直达声场的房间。

阅读理解

40 years ago the idea of disabled people doing sport was never heard of. But when the yearly games for the disabled were started at Stoke Mandeville, England in 1948 by Sir Ludwig Guttmann, the situation began to change.

Sir Ludwig Guttmann, who had been driven to England in 1939 from Nazi Germany, had been asked by the British government to set up an injuries center at Stoke Mandeville Hospital near London, His ideas about treating injuries included sport for the disabled.

In the first games just two teams of injured soldiers took part .The next year, 1949, five teams took part. From those beginnings, things have developed fast. Teams now come from abroad to Stoke Mandeville every year. In 1990 the first Olympics for the disabled were held in Rome, in the same place as the normal Olympic Games. Now, every four years the Olympic Games for the disabled are held, if possible, in the same place as the normal Olympic Games, although they are organized separately. In other years games for the disabled are still held at Stoke Mandeville, In the 1984 Wheelchair Olympic Games, 1,064 wheelchair athletes form about 40 countries took part. Unfortunately, they were held at Stoke Mandeville and not in Los Angeles, along with the other Olympics.

The games have been a great success in helping the progress of international friendship and understanding, and in proving that being disabled does not mean you can’t enjoy sport. One small source of disappointment for those who organize and take part in the games, however, has been the unwillingness of the International Olympic Committee to include disabled events at the Olympic Games for the able-bodied. Perhaps a few more years are still needed to persuade those fortunate enough not to be disabled that their disabled fellow athletes should be included.

小题1:The first games for the disabled were held ___ after Sir Ludwig Guttmann arrived in England.

A.40 years

B.21 years

C.10 years

D.9 years小题2:Besides Stoke Mandeville, surely the games for the disabled were once held in_____.

A.New York

B.London

C.Rome

D.Los Angeles小题3:What do we know about Sir Ludwig Guttmann from the passage?

A.He is an early organizer of the games for the able-bodied

B. He is welcomed by the British government

C.He is an injured soldier.

D.He is from England.小题4:From the passage, we may know that the writer is_____.

A.in favor of holding the games for the disabled

B.against holding the games for the disabled

C.a disabled person who once took part in the games

D.one of the organizers of the games for the disabled

单项选择题