The quantity of MOB was much higher than the background value.
甲烷氧化菌的数量明显高于背景值。
Its radon pollution is low, near to the environment background value.
氡污染水平较低，接近环境本底水平值。
The background value of Beryllium element in soil of China was studied.
本文介绍了我国土壤中铍的背景值结果。
The background value of Beryllium element in soil of China was studied.
本文介绍了我国土壤中铍的背景值结果。
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