第二章噪声的危害一、噪声会引起耳聋冶金企业的大部分工作场所属强噪声环境。在90分贝(A)[(A)是计权声级,见第章三第三节]以上的环境下工作,感到剌耳难受,天长日久就会引起噪声性耳聋。根据国际标准化组(ISO)的定义,500、1000和2000赫三个频率的平均听力损失超过25分贝,称为噪声性耳聋。在这种情况下,正常交谈时,听力发生障碍。在高强噪声的工作 Chapter II of the harm of noise First, the noise can cause deafness Most metallurgical enterprises in the workplace is a strong noise environment. Working in an environment above 90 dB (A) [(A) is a weighted sound level, see chap. III, sect. III], it is felt uncomfortable and may lead to noise-induced deafness over time. According to the International Standards Organization (ISO), the average hearing loss at three frequencies of 500, 1000 and 2000 Hz exceeds 25 dB and is called noise-induced deafness. In this case, normal conversation, hearing disorders. Work in high-intensity noise