The research results of recovering copper by electrowinning from concentrated cyanide solution were described.叙述了从富集氰化废液中电解回收铜的试验研究结果.Zinc base die castings are always copper plated in cyanide baths.锌基合金的压铸件总是在氰化镀液中镀铜.Th...
The UN is facing a cash crunch.联合国面临着现金短缺问题。Caarackle! A cheery crunch, scraps of miniature thunder sound as the shells collapse.嘎嘣！欢快的裂壳声像是一片微弱的雷鸣。A latecomer to the credit crunch, Berlin's challenge is to keep Ger...