火药是由硫 、 碳和硝酸钾组成.Gunpowder is composed of sulfur, carbon, and potassium nitrate.氨对硝酸钾的选择分离结晶效果较好.And ammonia had effective selectivity for the separation of potassium nitrate.用氯化钾与硝酸铵为原料,采用复分解法生产农用硝酸钾与氯化铵.Agricultural pot...
一列拖拉机突破了警戒线,隆隆响着驶上了高速公路。A line of tractors rumbled onto the motorway through a cordon of police.三英里之外, 一列火车隆隆响着穿过山谷.A train, three miles away, roared across the valley.河水隆隆响着,又浓又稠, 闪烁而颠动, 像是流动着沉重的金属.The viscous water, fl...
This district is getting more and more prosperous and bustling.这一带越来越繁华了....one of the most dynamic and prosperous cities in the Mediterranean.地中海地区最有活力、最为繁荣的城市之一The division between the prosperous west and the impoveris...