这封信只不过重复了一下土地法。The letter merely restated the law of the land.能从其他废料中分离出可重复利用成分是很关键的。The ability to separate out reusable elements from other waste is crucial.他不想刻意重复那种讲话的语调。He is not attempting necessarily to reproduce ...
The method of determining Ni, Cu and Pbi n urine with isotope dilution mass spectrometry ( IDMS ) is described.介绍了采用同位素稀释质谱法 ( IDMS ) 测定冻干人尿样品中镍 、 铜、铅的含量.The stability of a dynamic dilution system for Unsymmetric dimethy...