The pre-treatment of them before conventional cyanide leaching includes roast, chemical oxidation and biological oxidation.
在传统氰化浸出之前进行的预处理过程包括焙烧，化学氧化和生物氧化。
2
The output of voice in the conventional speech alarm system of hydropower plants is achieved by pre taping.
传统的水电厂语音报警系统是采用预录音的方式来得到语音文件。
3
The results of ozone pre-oxidation and conventional process treating slightly-polluted source water showed that this unit could reduce effectively COD_(Mn), color and turbidity.