无论是下水道里，还是地板下面，都有许多耗子绕着它们蹿来蹿去。The rats skittered around them in the drains and under the floorboards.托尼自己盖了房子并铺设了下水管道。Tony built his own house and laid his own drains.我们蹲在水池旁，看着潜水者慢慢沉下水。We squatted beside the pool and wa...
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 ...