生产环境中存在的化学性、物理性因素(例如毒物、噪声等)对健康是有危害的。一般可以从两方面对其加以预防,一方面是从环境方面将这些危害因素限制在一定浓度或强度之下,那么劳动者在这种限定的环境条件下一天工作八小时终生可以不得病;另方面是从医学临床方面早期检测临床症状或亚临床症状。在工业化国家,近年来,除了一些特殊的疾病例如矽肺和癌症之外,大多数传统的职业性疾病已经大大减少,例如现在很难找到一个典型铅中毒的病例,因为当血中ALA轻度增加时就反映暴 The chemical and physical factors (such as poison, noise, etc.) existing in the production environment are harmful to health. Generally, it can be prevented from two aspects. On the one hand, these harmful factors are limited to a certain concentration or intensity from the environmental aspect. In this limited working environment, laborers can not suffer disease for a lifetime of eight hours a day. In terms of clinical aspects of early detection of clinical symptoms or subclinical symptoms. In the industrialized countries, most traditional occupational diseases have been greatly reduced in recent years, except for some special diseases such as silicosis and cancer. For example, it is very difficult to find a typical case of lead poisoning because when blood ALA increases slightly When reflected on the storm