Butyraldehyde 1,2 proparediol acetal was synthesized by using stannous chloride as catalyst.以非质子酸氯化亚锡为催化剂,催化合成了丁醛-1,2-丙二醇缩醛.Butyraldehyde 1,2 propanediol acetal was synthesized by using stannous chloride as catalyst.以非质子...
The first plane-loads of food, children's clothing and medical supplies began arriving.首批飞机运送的食物、儿童衣物和药品开始抵达。A technician loads a video tape into one of the machines.一名技师把一盒录影带装进其中一台机器。Having loads of children takes...