目的: 合成新的双-胡椒醛缩二胺类席夫碱化合物.Methods: Five Schiff bases were prepared from piperonal and diamines by condensation reaction.用胡椒醛为起始原料,经氯化 、 水解、缩合,制得血凝酸胺.After the process of chlorination, hydrolytic decomposition and condensat...
The Strand is one of London's busiest and most affluent streets.斯特兰德街是伦敦最繁华、最富足的街道之一。a very affluent neighbourhood富人区It's a fallacy that the affluent give relatively more to charity than the less prosperous.富人比...
Economizer leakage is a main problem in running of heat recovery boiler.省煤器泄漏是余热锅炉运行中常遇到的问题.Steam pressure exploded the boiler.蒸汽的压力使锅炉爆炸了。And then advice on choosing the methods of deoxygenation of boiler water is given...
她走到窗前，拉起了百叶窗。She went to the window and raised the blinds.她母亲拉起她的双手放到自己脸上。Her mother brought her hands up to her face.她拉起吉尔的手。She took Gill by the hand....