Aspirin is synthesized through O - acylating reaction from acid and anhydride acid with anhydrous carbonate as catalyst.以水杨酸和乙酸酐为原料,采用无水碳酸钠作为催化剂经O - 酰化反应合成了阿司匹林.In 2002, we develop Photo - catalyst & electronic Ionizer A...
The dog began to yowl.那只狗开始哀嚎。Cats yowl. My dog's hair bristles in response.这些猫的哀叫引得我的狗毛发竖立。Suddenly, the cat lets out a heart - rending yowl.突然, 那猫发出一声撕心的嚎叫....
下图展示了昆虫怎样由卵成长为成虫的过程.The pictures below show, how insects grow from eggs into adults.成虫的生命期很短.Adult fireflies live a short life.目的观察甲苯咪唑对广州管圆线虫成虫的杀灭效果.Objective To observe the effect of mebendazole against adult worm of A...
He’s got the looks of a film star now, but he was a real ugly duckling as a child.他现在一副电影明星的模样,小时候他可真是只丑小鸭。We’re going to feed the duckling.我们去喂小鸭子。He's got the looks of a film star now, but he was a real ugly duckl...