nitrogen gas氮气
nitrogenn.氮
nitrogen supplying level施氮水平
nitrogen-doped titania氮掺杂
Nitrogen fertilizer rate施氮量
nitrogen level of supply氮素水平
nitrogen dilution method氮气稀释方案
nitrogen nutrition index氮素营养指数
Nitrogen producing plant制氮设备
nitrogen-making device制氮装置
nitrogen partition tests[医] 氮分配试验(检肝机能)
nitrogen content of leaf叶片含氮量