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  1. ... produced by cars and factories include sulphur dioxide,oxygen oxides,Carbon Monoxide,Photochemical Oxidants, Lead Nitrogen Dioxide,Respirable Suspended Particulates,Total Suspended Particulates (

    分類:科學及數學 > 地理學 2009年02月11日

  2. ...temperature and pressure. The two most common parts of the air are nitrogen (roughly 78% of the total) and oxygen (roughly 21% of the total). Together, the...

    分類:科學及數學 > 地理學 2006年12月14日