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 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 st...
In the fall, Wilma limped off to school.到了秋天, 威尔玛一拐一拐地上学去了.Wilma : that's right, betty. He just left. Costume and all.是啊, 贝蒂. 他刚出发了. 穿了那套衣服,带着那副神气走了.I met Wilma once, briefly...我曾经和威尔玛有过短短的一面之缘。I met Wilma once, bri...
He showed him how to blow into the ivory mouthpiece.他给他演示如何吹奏象牙吹口乐器。The Ivory Coast became the world's leading cocoa producer.象牙海岸成为世界上可可粉的主要产地。a ban on the ivory trade象牙贸易禁令...
Authorities requisitioned hotel rooms to lodge more than 3,000 stranded Christmas vacationers.当局征用旅馆房间安顿了3,000多名无处落脚的圣诞度假者。The town hall was requisitioned as army headquarters.市政厅徵用作了军队的指挥部.The soldiers requisitioned the...