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【多选题】
下列关于听觉的神经齐射理论，描述正确的有( )
A.
该理论由韦弗尔提出
B.
认为当声音频率低于400赫兹时，听神经个别纤维的发放频率是和声音频率对应的
C.
个别神经纤维无法对频率高的声音单独作出反应，神经纤维将按齐射原则发生作用
D.
个别纤维具有较低的发放频率，它们联合“齐射”，就可以反应频率较高的声音
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参考解析：
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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 making 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