这些地区被军队封锁包围了。The areas are sealed off and ringed by troops.那里的士兵将封锁机场。Soldiers there are going to seal the airport off.直升飞机的探照灯来回扫射这个被封锁的公园。Helicopters with searchlights swept the park which was sealed off....
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.The usual thinners are water, ethanol, isopropanol, ethylene ...