In the absence of catalyst, but the reduction rate of copper is low,and the effect of C/Cu2S ratio is obvious and that of CaO/Cu2S ratio is very small.是什么意思_In the absence of catalyst, but the reduction rate of copper is low,and the effect of C/Cu2S ratio is obvious and that of CaO/Cu2S ratio is very small.在线翻译_英语_读音_用法_例句