The progresses in the synthesis study of isoamyl isovalerate at home and abroad were reviewed.综述了国内外对异戊酸异戊酯的合成研究的进展情况.Isoamyl butyrate was synthesized by using potassium bisulfate as the catalyst.以硫酸氢钾为催化剂,正丁酸和异戊醇为原料合成了正...
Four nozzles , canted outboard, split the exhaust of the solid rocket motor into four equal tails.四个向外倾斜的喷管把固体火箭发动机的排气流分成四个相等的尾巴.In practice, the turbine disc and the nozzles are fitted into a casing.实际上, 涡轮圆盘和喷嘴是装在机壳里的....
Don't reckon upon your relatives to help you out of trouble.不要指望你的亲戚会帮助你摆脱困境.We reckon to arrive in Delhi at noon.我们估计正午抵达德里." I reckon so,'said Huckleberry; anyways, I'm suited.“ 我猜是这样, ”哈克贝利说, “不管怎样讲, 我挺...
Numerically, there are a lot of young people involved in crime.从数字上看，有很多年轻人犯罪。His men were far superior numerically.他手下的士兵在人数上占了绝对优势。The enemy were numerically superior, ie There were more of them.敌人在数量上占优势....