This paper discussed three methods of producting vinyl etherspreparation from acetylene, dehydrohalogenation and acetals.论述了乙烯基醚类化合物的三种主要制备方法乙炔法 、 脱卤化氢法和缩醛热分解法.Allene is an isomer of methyl acetylene.丙二烯是甲基乙炔的一种异构体.In th...
Allene is an isomer of methyl acetylene.丙二烯是甲基乙炔的一种异构体.In the darkness, the machine gun spat a vindictive white light like an acetylene torch.机枪在黑暗中吐出一道凶厉的白光,活象一支喷火的乙炔吹管.In the high - pressure system both oxygen and acet...
The operation can be done under local anaesthesia.该手术可以在局部麻醉的情况下实施。Conclusions: It is very importment to choice the patients and anaesthesia.结论: 选择合适的患者及麻醉方式是手术成功的关键.Conclusion Anaesthesia by muscle injection is the safe...
The restaurant is operated by the Palo Alto Auxiliary for the benefit of the Lucile Salter Packard Children's Hospital.这家餐厅由帕洛阿尔托附院经营，收益用来资助露西尔·帕卡德儿童医院。Palo Alto boasted 36 percent more men than women.帕洛阿尔托一度吹嘘其男性人口...
the comedy duo Laurel and Hardy劳莱和哈代这对喜剧搭档The violinist walked on the stage and the duo became a trio.那位小提琴家走上台,二重奏变成了三重奏组.Ah Duo bit his lips to keep from laughing aloud.阿多咬住了嘴唇暗笑....
Another example of cystitis glandularis intestinal type ( intestinal metaplasia ) .分布广泛的肠上 皮化生.The diagnosis and treatment of essential acquired cold urticaria and cystitis are discussed in the article.根据气候条件,避免寒冷,及时诊断和治...
早在十七岁的小小年纪,我就离开了家.At the tender age of seventeen I left home.通常总共只有十一二个会员。现在将至少有十七个。Normally it has only had eleven or twelve members in all. Now it will have seventeen at the very least.现代派诗人就其许多想象又回到了十七世纪极抽象派诗人的意象诗中.Th...
He was sidling into the bar, obviously trying to be inconspicuous.他悄悄地走进酒吧，显然不想引起注意。Another pause, and more eying and sidling around each other.两个人暂停了一会儿, 接着又眼对眼,身子侧身子兜着圈子走了几步.They broke asunder, sidling out of their ben...