Isn't the nonradioactive form of thallium used for rat poison?.铊的非放射性形态不是用于制造老鼠药吗？Isn't the nonradioactive form of that used for rat poison?铊的非放射性形态不是用于制造老鼠药 吗 ?...
Her face was freckled all over.她的脸长满雀斑.Her freckled skin glowed with health again.她长有雀斑的皮肤又泛出了健康的红光。He was tall, vigorous, sandy - haired, freckled, genial and voluble.他个子高高的, 精神抖擞, 淡茶色的头发, 脸上有雀斑, 性情和蔼,口齿伶俐....
Doped silicon and germanium are technologically the most important types of semiconducting material.添加硅和锗在工艺上是半导体物质中最重要的类型....a technologically advanced society.科技发达的社会Many senior managers are technologically illiterate....