Methods The work processes and records of dust measurements were examined. Free SiO2 content from agate samples was measured.
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- 方法测定广州某珠宝加工厂 33名玛瑙尘接触工人作业环境玛瑙尘的总尘浓度、分散度和游离SiO2含量；
- 今日热词
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- 深远海浮式风电平台 - deep-sea floating wind power platform
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- 京雄高速公路 - Beijing-Xiongan expressway
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- 农业及相关产业增加值 - the added value of agriculture and related industries
