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。

youdao

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。

youdao

In normal conditions there are no notable amounts of other polar molecules in the air except water vapour, especially in areas where people work.

在通常条件下，在空气中除了水蒸汽外，没有其他极性分子的影响需要考虑，特别是在人们工作的区域。

youdao