一只大盘子直向听差的脑袋飞来.A large plate came skimming out , straight at the footman's head.我打了铃, 吩咐听差把我的旅行皮包收拾好.I rang the bell, and directed my servant to pack my portmanteau.秘书们和身穿制服的听差们步履轻徐,一如太平年月.Secretaries and uniformed ...
Chlorination is carried out with Nhaloamines and sulfuric acid.氯化是用N- 卤胺和硫酸.The practice of chlorination has become so widespread.氯化法在实践中已得到广泛应用.The process of 2 - chloropyridine chlorination synthesis by pyridine and ap...