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...
His works include operas, symphonic, choral and chamber music.他的作品包括歌剧, 交响乐, 合唱和室内乐.Fuel gushes into the combustion chamber.燃料喷进燃烧室.You will be chiefly responsible for the Chamber's advertising ( magazine and space ...
Opera in three acts by G. Puccini , Libretto by G. Giacosa and L. Illica.三幕歌剧:G. 普契尼作曲;G. 贾柯查和L. 伊里卡编剧.Over the years Freni has been one of the supreme interpreters of Puccini's heroines.多年来弗雷尼一直是普契尼歌剧女主角的最佳表演者之一。Su...