Methods: 68 coke oven workers were chosed as exposing group and 30 health people without any occupational exposure history of carcinogen were chosed as the control group.
方法：以炼焦工人68例为接触组，无任何职业致癌物接触史的健康体检者30例为对照组。
Methods Retrospective epidemiological cohort study and field survey were conducted for dermatological examination, occupational hygiene and occupational exposure history for 2 876 workers.
方法采用现况调查和回顾性队列研究方法，对2 876名队列成员进行皮肤科检查和现场职业卫生学及个人职业史的调查。
These are cases in which a worker is infected with HIV and has a history of occupational exposure, but did not have a test immediately before and after the possible exposure.
以下是某些具有职业接触史，并感染了HIV病毒的工作人员的病例，但他们在可能受感染的接触之前和之后都没有立即进行检测。
It introduced the research history, concept and occupational risk factors of vocational exposure.
介绍了职业暴露的研究简史、概念及职业危险因素。
Some information was investigated including general information, history of occupational exposure and respiratory disease etc.
调查其一般情况、职业接触史、呼吸道疾病等情况；
Some information was investigated including general information, history of occupational exposure and respiratory disease etc.
调查其一般情况、职业接触史、呼吸道疾病等情况；
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