nitrogen gas氮气
nitrogenn.氮
nitrogen-oxide reductase氮氧化物还原酶
nitrogen-deficient waste缺氮废水
nitrogen-cooling circuit氮气冷却回路
nitrogen injection in goaf采空区注氮
nitrogen-containing base含氮基团
nitrogen metabolism enzyme氮代谢酶
nitrogen fixative bacteria固氮菌
nitrogen plasmas treatment氮等离子体
nitrogen precooling system氮水预冷系统
Nitrogen removal mechanism脱氮机理