undetermined nitrogen 未定氮...active nitrogen 活性氮...carbon-nitrogen cycle 碳-氮环...justifiable nitrogen 实氮...nuclear nitrogen 环中的氮...nitrogen balance 氮平衡氮平衡...basic nitrogen in oils 油中碱性氮(化石物)...amide nitrogen 酰胺氮酰胺氮...nonprotein nitrogen 非蛋白氮...imino nitrogen 亚氨型氮...oxides of nitrogen 氧化氮...mustard nitrogen 氮芥...nitrogen trioxide 三氧化二氮...usea nitrogen 脲氮,尿素氮...pentoxide nitrogen 硝酸酐,五氧化二氮...nitrogen degradation 氮降解;土壤中氮降解...Kjeldahl-Gunning method (for nitrogen determination) 克耶达-冈宁定氮法...ethods for nonprotein nitrogen 非蛋白氮测定法...illegitimate nitrogen 虚氮,非实氮...authentic nitrogen 实氮(摄取的氮在组织或排泄物中...ammonium nitrogen fertilizer 铵态氮肥...
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