【判断题】
引起听觉的声音,不仅在频率上有一定范围,而且在声强上也有一定范围。对于任意在人耳听觉范围内的频率( 20Hz— 2000Hz)来说,声强还必须达到某一数值才能引起人耳听觉。The sound which can be perceived by human hearing has a certain range not only in frequency but also in sound intensity. In the range of human hearing(20Hz-2000Hz), the sound intensity must reach a certain value before any frequency can cause human hearing.
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