Polar filler are used in normal phase chromatographic system, among which, silicon gel is the most commonly used.
正相色谱系统使用极性填充剂，常用的填充剂有硅胶等。
2
The manufacture cost which approaches normal lead-acid battery level, is reduced by 30%-50% compared with the existing dual-pole polar plate lead-acid battery.
制造成本比现有双极型极板铅酸电池下降30% - 50%，接近普通铅酸电池水平。
3
In normal conditions there are no notable amounts of other polar molecules in the air except water vapour, especially in areas where people work.