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丁酸异戊酯.Isoamyl butyrate was synthesized by using ceric sulfate as the catalyst.以硫酸高铈为催化剂,正丁酸和异戊醇为原料合成了正丁酸异戊酯.Isoamyl bu...
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...
An impartial onlooker must be sought out.须问旁观冷眼人.It can help to have an impartial third party look over your work...让客观公正的第三方看一下你的成果会有助益。It can help to have an impartial third party look over your work.让客观公正的第三方看一下你的成果会有...
You'll have to get a passport, and you'll also need a visa.你必须申办护照, 同时还需要有签证。The chief protagonists in the row are Visa and Mastercard, the world's leading credit card brands.这场纠纷的主角是世界两大信用卡品牌——维萨和万事达。You ...
His nerves jumped with anger as the sewing - machines stared and stuttered and buzzed.听到缝纫机又发出喀嚓喀嚓的声音,他气得青筋暴起.The old truck stuttered along the winding road.这辆旧卡车在蜿蜒的公路上缓慢地颠簸前行。The old truck stuttered along the winding r...
Are cavernous sinus hemangiomas and cavernous malformations different entities?海绵窦血管瘤和海绵状血管畸形是不同的病变 吗 ?Hemangiomas are the most common benign vascular tumors of andand neck region.血管瘤是婴幼儿最常见的先天性良性血管肿瘤,约60%发生于头颈部.Objectiv...
The directors anticipated a fall in demand.董事们预感需求会降低。As he had anticipated, a thundering iron gate fell nearby, barricading the entrance to the suite.果然不出馆长所料, 附近的一扇铁门轰然倒下, 封住了通往画廊的入口.When Scott reached the South Pole h...