Amnesty workers have been barred from Sri Lanka since 1982...从1982年起,大赦国际的工作人员就被禁止进入斯里兰卡。Sri Lanka had considerable scope for influencing world prices for tea in the early 1960 s.在六十年代初期,斯里兰卡有相当大的力量影响世界茶叶的价格.Burma is nor...
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...