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 potassium bisulfate 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 butyrate was synthesized by using ceric sulfate as the catalyst.以硫酸铈铵为催化剂,...
The spacious living quarters were on the second floor.宽敞的生活区位于3楼。At every turn smoke and flame stopped efforts to get into the living quarters.到处是烟雾和火焰，根本无法进入住处。What outfitting is included in the living quarters?居住舱室有哪些舾...
所有人起立为他不可磨灭的英勇之举鼓掌。Every person stood to applaud his unforgettable act of courage.当她走上台时，观众起立鼓掌欢迎。When she walked onstage she was given a standing ovation.当我走进去时，他们全都起立鼓掌。When I walked in, they all stood up and started c...
If I could just make another small point about the weightlifters in the Olympics.请允许我就有关奥运会举重运动员的问题再补充一点。What do you think of the standard of the top Chinese weightlifters?你认为中国顶尖举重运动员的水平如何?What is the optimum starting a...