nitrogenasen.[生化]固氮酶
nitrogenn.氮
nitrogen filled lamp充氮灯
nitrogen-free agar无氮培养基
nitrogen-hardening渗氮硬化
nitrogen reinjection氮气回注
nitrogen application氮肥撒施机
nitrogenous compound氮化合物
nitrogen oxychloride亚硝酰氯,氯氧化氮
nitrogen deformation氮化变形
Nitrogen translation氮素运转
nitrogen preparation氮气制造