大量元素浓度组合
Concentration’s combination of macroelements
大剂量多种微量元素补充
big dose of many trace elements supplementing at the same time
同济大学化学系；微量元素研究所
department of chemistry
Institute of Trace Elements
tongji university
超音波法液位元元元元元元测定
ultra-sonic method of liquid meaduremert
14个微量元素
14 Microelements determination
氨基酸螯合微量元素
Amino Acid Chelate trace
chelate amino acid microelement