知识贝壳
知识贝壳
所属栏目：英汉双解无机化学
1. The relative amount of agiven element among others; for example,theabundance of oxygen in the Earths crust isapproximately 50% by mass2. The amount of a nuclide (stable or ra-dioactive) relative to other nuclides of thesame element in a given sample. T ......（本文共 622 字 ） [阅读本文] >>