Biological nitrogen fixation (BNF), which provides all the plants on the globe with 75% of fixednitrogen, is one of the important projects in life science.
生物固氮为全球的植物提供75%的氮素，是生命科学中的重大课题。
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The nitrogen Deoxo Vessel contains a fixed bed of free copper catalyst which removes oxygen from the nitrogen stream by oxidation of copper to copper oxides.
氮气脱氧罐中装有一个游离铜催化剂的固定床，通过将铜氧化成氧化铜把氧气从氮气中脱除。
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Results show that four major influence factors of pulverized coals NO static emission amount are carbon content, fixed carbon content, nitrogen content and ash content respectively.