归纳了对苯二胺的各种制备方法,并讨论了其工业化的优劣.The synthesis ofp - Phenylenediamine was summarized and its route of industrialisation was discussed.简要介绍了对 苯二胺 的用途和新工艺法合成对 苯二胺 的前景.Finally, application ofp - phenylenediame and its new craft p...
那里每年秋天有2,000头灰色小海豹出生。Two thousand grey seal pups are born there every autumn.为了获得海豹皮而用棍棒打死幼海豹是不道德的。Clubbing baby seals to death for their pelts is wrong.每年对海豹的选择性宰杀the annual seal cull...