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在一次呼吸系统的流行病学调查中,检查了178名牙科实验室技术员和69名非接触的对照人员。其中研磨非贵重金属平均工龄28年的8名技术员,经胸部X线检查诊断为单纯尘肺。FVC和FEV_1的平均值对
In a respiratory epidemiological survey, 178 dental laboratory technicians and 69 non-contact controls were examined. Among them, eight technicians who grind non-precious metals with an average working length of 28 years have been diagnosed as simple pneumoconiosis through chest X-ray examination. The mean pair of FVC and FEV_1