目的: 采用分光光度法,以芦丁为标准品测定异叶青兰中的总黄酮含量.Objective: Flavonoids in Dracocephalum heterophyllum was investigated by spectrometric method with rutin as standard material....
他为人文雅,结交广泛。He is a cultured man with a wide circle of friends.他文雅、迷人、能言善辩,是一名优秀的谈判人。He is polished, charming, articulate and an excellent negotiator.她说他文雅而迷人。She describes him as urbane and charming....
Otters are believed to have been on Earth for 90 million years.水獭被认为存活在地球上已经9千多万年.Long - tail Weasels have long slender bodies. They are related to minks and otters.长尾鼬鼠有着细长苗条的身体. 他们和水貂、水獭是同种的动物.An attempt is being made ...