where the aim is to identify or detect the presence of a species qualitative ysis is carried out. in circumstances where the amount of a substance present is measured, quantitative ysis is used.
光速不变原理指的是
重量法、容量法、光谱法和质谱法都是分析方法,不是分析技术。
投标人应按招标文件的规定和要求编制投标文件。()
请按照答题格式,把下列单词划分出音节。 (答题格式:打出原单词,再以“/“划分音节,如:fi/nal。每个单词之间空一格) neighbour thirty bottle english particular