然而含有硅石和硅酸盐的工业品都有肯定的效果.The commercial product however, containing silica and silicates, has a positive effect.富集操作除去粘土和硅石达到相当高的程度.Beneficiation removes clay and silica to considerable extent.硅石实际上是一种有用的杂质,因为它是一种反应剂.Silica...
Such packing is convenient for use in laundries, hospitals and restaurants.这样做更适于洗衣店 、 医院及餐厅使用.In Shanghai the laundries and dyeing shops apply quite meticulous dyeing processes.上海洗染店染制工艺相当精良.Please put those laundries i...