Leaching, the recovery of copper from the drainage water of mines, as a method of the extraction of minerals, it was well established as early as the eighteenth century, but until about 25 years ago miners did not realize that bacteria take an active part in the process.
Leaching, the recovery of copper from the drainage water of mines, as a method of the extraction of minerals, it was well established as early as the eighteenth century, but until about 25 years ago miners did not realize that bacteria take an active part in the process.
Aas a method of the extraction of minerals, it was well established 分析A选项
Bas a method of the extraction of minerals well established 分析B选项
Cwas a well-established method of mineral extraction 分析C选项
Dwas a well-established method of extracting mineral that was 分析D选项
Ehad been a method of mineral extraction, well established 分析E选项