聽(tīng)力零級(jí)
眼耳鼻喉

        聽(tīng)力零級(jí)或聽(tīng)力計(jì)零級(jí)是純音聽(tīng)力計(jì)上聽(tīng)力損失或聽(tīng)力級(jí)為“0”dB的含義值。在可聽(tīng)聲范圍內(nèi)(20～20,000Hz,但聽(tīng)力計(jì)只采用125～8000或10,000Hz)各種頻率的純音信號(hào)能引起人聽(tīng)覺(jué)的最小有效聲壓各不相同,人與人之間亦有差異。而聽(tīng)力零級(jí)    （共 1535 字）     [閱讀本文] >>