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...
建筑工人在8根细柱上架起轻巧的混凝土穹顶。The builders have perched a light concrete dome on eight slender columns.最终，水会渗透进周围的混凝土中。Eventually, the water will permeate through the surrounding concrete.鲜花摆上之后，突兀的混凝土墙便显得柔和起来。Stark concrete wall...
There's a Ukrainian film at the Angelica that's supposed to be very powerful.有部不错的乌克兰电影,有兴趣吗?Agricultural interests are some of the most powerful lobbies in Washington.农业利益集团是华盛顿最具影响力的游说团体之一。The divided family ...