自然背景值
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The natural background values of Hg in soils of Dalian was also obtained.
给出了大连市土壤中汞的自然背景含量。
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This article gives an account of the relationships between the natural background values of elements in soil and environmental conditions.
本文详细叙述了土壤中元素自然背景值与环境的密切关系。
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