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【多选题】
关于听觉的行波理论的正确描述有( )。
A.
该理论是由某种生理学家冯·贝克西提出来的
B.
认为声波传到人耳,将引起整个基底膜的振动
C.
振动从耳蜗底部开始,逐渐向蜗顶推进,振动的幅度也随之增高,振动运行到基底膜的某一部位,振幅达到最大值,然后停止前进而消失
D.
随着声音频率的不同,基底膜最大振幅所在的部位也不同
E.
声音频率低,最大振幅接近蜗顶;频率高,最大振幅接近蜗底(即镫骨)处,从而实现了对不同频率声音的分析
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【单选题】Every year television stations receive hundreds of complaints about the loudness of advertisements. However, federal rules forbid the practice of ads louder than the programming. In addition, t...
A.
TV stations always operate at the highest sound levels
B.
their sound levels are kept around peak levels
C.
their sound levels are kept in the middle frequency ranges
D.
unlike regular programs their intensity of sound varies over a wide range
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【单选题】Every year television stations receive hundreds of complaints about the loudness of advertisements. However, federal rules forbid the practice of ads louder than the programming. In addition, t...
A.
TV stations always operate at the highest sound levels
B.
their sound levels are kept around peak levels
C.
their sound levels are kept in the middle frequency ranges
D.
unlike regular programs their intensity of sound varies over a wide range
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