In the reaction of acetylation and nitration 1,2 ? dichloroethane was used as solvent.在乙酰化、硝化反应中引入了1,2-二氯乙烷溶剂.Polyurethane demulsifier for crude oil were prepared from polypropylene glycol, xylene, toluenediiso - cyanate...
There will have to be a second round of voting when new candidates can enter the fray...将不得不进行允许新的候选人加入角逐的第二轮投票。Benjamin Robins then entered the fray with articles and a book.而后,BenjaminRobins以他的几篇专论和一本书参加争论.The two gang...
"I guess you guys don't mind if I smoke?" he drawled.“伙计们，我想你们不介意我抽烟吧？”他拉长音调说。" Whoever heard of ten cents? " drawled the rickshaw man.“ 那里有一毛钱的,车夫懒懒地说.He drawled a greeting to her.他慢吞吞地对她说声问候。...