environmental limit concentration
... environmental levy环境税 environmental limit concentration环境浓度极限；环境浓度限度 environmental management环境管理 ...
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考虑到氢气易燃，本文采用光纤作为敏感探头元件，在氢气环境下测试低于爆炸极限的氢气浓度。
Taking the flammability of hydrogen into account, in this paper, optical fiber is used as a sensing probe in hydrogen environment to test the hydrogen concentration which is below the explosive limit.
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