Diisopropyl succinate was synthesized from succinic acid and isopropanol with p - methyl benzenesulfonic acid as catalyst.摘要以丁二酸和异丙醇为原料及对甲基苯磺酸为催化剂,催化合成丁二酸二异丙酯.Diisopropyl phosphite was directly synthesized from phosphoru...
埃及大部分土地都租给“皇家 ” 佃农.Most of his land was leased to " royal tenants ".最后他们不得不卖掉土地,成为负债累累的佃农.They are then compelled to sell their land and become tenants with large debts.佃农对土地的使用权佃农拥有土地的法律使用权.The legal tenure by which a v...