Patients of two groups did choledochus drainage and peritoneal drainage in the same time.开腹组27例.两组病人同时行胆总管引流及腹腔引流.Design storm hyetograph is the essential element for hydrologic modeling analysis and storm water drainage...
研究了用酸性乙腈硫酸铜体系从辉铜矿中提取铜.Leaching of copper from chalcocite with acidic acetonitrilecopper sulphate system was studied.除自然铜和孔雀石之外, 还有黄铜矿 、 斑铜矿 、 辉铜矿 、 铜蓝和黝铜矿等.In addition to the natural copper and malachite, there are chalc...