短語詞組短語nitrogen phosphorus balance 釩Nitrogen Mass Balance 氮質(zhì)量平衡nitrogen n balance 氮平衡apparent soil -nitrogen-balance rate 土壤氮素表觀平衡率megative nitrogen balance 負(fù)氮平衡permeability nitrogen balance 氮平衡nitrogen transformations and balance 氮轉(zhuǎn)化與平衡energy and nitrogen balance 能氮平衡 返回 nitrogen balance