所屬欄目:英漢雙解化學(xué)
1. The relative amount of agiven element among others; for example,the abundance of oxygen in the Earth’scrust is approximately 50% by mass. 2.The amount of a nuclide (stable or radioactive)relative to other nuclides of the sameelement in a given sample,T ......(本文共 622 字 ) [閱讀本文] >>