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 ...
The slow-worm is in fact not a snake but a legless lizard.蛇蜥其实不是蛇，而是无脚的蜥蜴。They found the locals getting legless on tequila.他们发现当地人喝龙舌兰喝得酩酊大醉。A critic be a legless man who teach running.批评家,是教人跑步的无腿人....
They offer tips on topics such as home safety.他们就家居安全等问题提供建议。The Oxford Chemistry Primers aim to cover important topics in organic chemistry.《牛津化学初级读本》丛书旨在论述有机化学中的重要问题。They talked amiably and easily about a range of topi...
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....