ppm ppb ppt的相關文章
ppm ppb ppt的相關商品
Parts-per notation - Wikipedia, the free encyclopedia
瀏覽：351
日期：2025-06-04
In science and engineering, the parts-per notation is a set of pseudo units to describe small values of miscellaneous dimensionless quantities, e.g. mole fraction or mass fraction. Since these fractions are quantity-per-quantity measures, they are pure nu...看更多
網友正在看
熱門 howeasy 文章
熱門 ces 2016 文章
