研究者在每个参试者嘴巴前30厘米区域采集空气样本并测量颗粒物质浓度。
Air in the breathing zone (about 30cm from the mouth) was sampled for each trip to measure PM concentrations.
调查东北某工业城市大气颗粒物质和多环芳香烃类化合物的浓度以及它们的致突变活性。
To investigate concentrations of polycyclic aromatic hydrocarbons (PAH) in Ambient particulate matter and their mutagenic activities in an Industrial Area of Northeastern China.
本文介绍了燃煤电厂锅炉排放颗粒物质量浓度的连续测定。
The paper describe on continuous measurement of the mass concentration of particulate matter emissions from coal fired power boiler.
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