钾质白云母是铅锌银矿床中的主要热液蚀变矿物,通常表现为白云母化、绢云母化、伊利石化.Potash micatization is one of the main hydrothermal alteration minerals genetically related to the lead - zinc - silver deposit.康山金矿田围岩蚀变主要为硅化 、 绢云母化、碳酸盐化及黄铁矿化.The main wall rock...
这支队伍需要一位他这样技术水平的司机。The team would have need of a driver of his worth.据报道，该矿事故发生率是全国平均水平的3倍。The mine reportedly had an accident rate triple the national average.北爱尔兰的失业率是全国平均水平的两倍。Unemployment in Northern Ireland is twice...