Thus , this reduced temperature of reaction and increased the rate of acetophenone.降低反应温度,提高了苯乙酮的收率.Objective: A new approach to prepare α - bromo - 4 - benzyloxy acetophenone was introduced.目的: 报道一种合成α - 溴-4-苄氧苯基乙酮的新方法....
人员的裁减和服务质量的下降之间显然是有联系的。There is an unquestionable link between job losses and deteriorating services.有可靠证据表明日光曝晒与皮肤癌之间有联系。There is convincing evidence of a link between exposure to sun and skin cancer.高失业率与物价上涨不一定有联系.Hig...
Gloria is probably the most down to earth personI've ever met.格洛丽亚也许是我见过的最脚踏实地的人了。To the best of my knowledge, Gloria did not make these comments.据我所知，格洛丽亚没这么说过。Gloria runs a hairdressing salon.格洛丽亚经营着一家发艺沙龙。...
In graphite sheets, carbon atoms bond together in rings.石墨层中的碳原子相互连接形成碳环。The superglue may not create a bond with some plastics.强力胶水可能无法粘住某些塑料。The threat of inflation is already evident in bond prices.通货膨胀的危险在证券价格上已经表现得很...
These difficulties have been overcome without detriment to performance.这些困难都已在不影响业绩的情况下得到了克服。He sits up very late to the detriment of his health.他常常熬夜,这对他的健康不利.Smoking is a detriment to one's health.吸烟危害健康....
Amphoteric monomer is prepared with acrylic acid , dimethylamine and chloroethanol by Mannich reaction.以丙烯酸、二甲胺、环氧氯丙烷为原料,通过曼尼希反应制得两性离子单体.Biological activities of amphoteric surfactants to higher or lower organisms were i...