He had a grin on his face like a Cheshire Cat.他咧着嘴笑呵呵的。I had motored down from Cheshire.我从柴郡一路南下开过来。Cheshire has promised a more detailed plan by next month.柴什承诺下个月将有更详细的方案出炉....
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...