以正庚醛 、 硫代硫酸钠和溴代正丁烷为原料,合成了正庚醛正丁硫醇缩醛.The heptanal butyl mercaptan was synthesized with heptanal, sodium thiosulfate and 1 bromobutane as raw materials.目的研究以庚醛和原甲酸三乙酯为原料制备庚醛二乙缩醛的工艺条件.Aim Enanthal diethyl acetal is prepared ...
设置或获得文档的安全域.Sets or gets the security domain of the document.曾参加过什么比赛或获得的奖项?What competition have you ever participated? Any award?它不是来自观念或获得知识.It is not about concepts or attaining knowledge....
It is just as likely that he was a charlatan peddling hocus - pocus.他过去恰恰很可能是个挨家挨户行骗的江湖医生.He worked as a door-to-door salesman peddling cloths and brushes.他的工作是上门推销抹布和刷子。The war against drug peddling is all about cash.禁毒...
She was compelled to fulfil the dying wishes of her mother.她不得不去实现她母亲的临终遗愿。He was compelled by illness to suspend his experiment.他因病不得不暂时中断实验.The rain compelled us to stay indoors.下雨使我们不得不待在室内。Leonie's mother was co...