预防医学是研究宏观现象的。它是以组成社会的人群为对象,研究环境、社会生活、工作条件以及各种致病因素对人群健康的影响和危害,采取预防措施,防患于未然,保证和促进人群健康的一门科学。当前由于生产力的不断发展,工农业日趋现代化,环境污染问题非常突出,接触各种有毒、有 Preventive medicine is the study of macroeconomic phenomena. It is a group of people in the community as the object, to study the environment, social life, working conditions and various pathogenic factors on the health effects and hazards of people, take preventive measures, take preventive measures to ensure and promote the health of the population of a science . At present, due to the continuous development of productive forces and the gradual modernization of industry and agriculture, the problem of environmental pollution is very prominent.