finite radius of the virtual source
virtual electron source
virtual heat source method
virtual source data item
Virtual source position
’virtual double-line’ method
nitrogen source
氮源
豆类氮源
氮气源
体细胞胚胎
氮素来源
氮源物质
氮肥形态
C/N比
氮素
氮素形态
碳源
氮来源
nitrogen and phosphorus non-point source pollution
nitrogen and phosphorous non-point source pollutio
Nitrogen and carbon source