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：896
日期：2025-10-31
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 wwdc 文章
熱門 flash 文章
![[推薦] 站崗女人的新法寶：就算手機不在身邊也能不漏接！](https://www.iarticlesnet.com/pub/img/article/24531/1403937261462_xs.jpg)
![[推薦] 好用的切片造型刀](https://www.iarticlesnet.com/pub/img/article/24520/1403937138979_xs.jpg)