一些生产及非生产部门,接触各类有害因素,这些有害因素可引起职业病,严重危害人们身体健康。而目前的医疗水平,对大多数职业病尚无满意疗效。因此,接触有害因素的人员掌握一些发病先兆的知识,对有效地早查早治是有好处的。职业病常有急性和慢性之分,急 Some production and non-production sectors are exposed to various harmful factors that can cause occupational diseases and seriously endanger people’s health. The current level of medical care is not satisfactory for most occupational diseases. Therefore, people who are exposed to harmful factors have some knowledge of the disease precursors, which is good for early detection and early treatment. Occupational diseases often have acute and chronic points, urgent