The CO 2 has a type of 4? ? ( PDB ) of the carbon isotope composition.
这种成因CO2具有典型-4‰ ( PDB ) 的碳同位素组成特征.
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The meteoric origin of geothermal water in study area is evidenced by its environmental isotope composition.
摘要环境同位素研究结果表明,研究区地热水为大气降水成因.
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