目的调查人造宝石厂和天然宝石厂粉尘危害情况。

Objective To survey the hazardous impact of gem dust on the health of workers.

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目的了解新建大型煤矿作业场所粉尘危害状况，为今后开展煤矿尘肺防治工作提供依据。

Objective To understand the status of dust hazard in the new large coal mines and provide the basis for the prevention of pneumoconiosis.

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目的摸清广东省宝石加工工作场所粉尘危害和宝石加工工人矽肺(GW S)的发病特征。

Objective To study the epidemiological features in harmful dust workplaces and silicosis in gem processing workers (GWS) in Guangdong.

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