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...
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...
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...
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....
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....
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。...