除铁 、 锰、铅外, 伴生有银、铟.Iron, manganese and lead are the major minerals, accompanying silver and indium.介绍了磷酸盐除铁的主要研究成果.Also , major research results for removing iron by phosphate has been introduced.用海绵铜生产硫酸铜,其困难在于除铁杂质.A har...
The change of fruit anatomical structure shows cell of exocarp, sarcocarp and endocarp division and enlargement.果实生长发育在解剖结构上表现为果实外果皮 、 中果皮及内果皮三部分细胞的分裂与膨大.That was an anatomical model of the human body for use in teaching...