The chemical contents in the sand quartz has reached national standards of silicon raw material for plate glass production after combined treating by magnetic separation plus diluted acid dipping.
Because there used to be a separation between themes and layouts, the CSS had to follow strict standards so it would work with multiple layout and theme combinations.
由于外观主题和布局的分离，CSS就需要遵循严格的标准才能适应多个布局及外观主题的组合。
3
If separation is used prior to assay for study samples but not for standards, it is important to establish recovery and use it in determining results.