nitrogenasen.[生化]固氮酶
nitrogenn.氮
nitrogen runoff loss氮素径流损失
nitrogenase activity固氮酶活性
nitrogen stimulation氮气吞吐
nitrogen fertilizers氮肥
nitrogen-free dier无氮日粮
nitrogen trichloride三氯化氮
nitrogen arc welding氮弧焊
nitrogen replacement氮气置换
nitrogen supply unit供氮设备
nitrogen monox-ide一氧化氮