经改进的光透法测试粉末粒度计算方法的原理是：同种粉末各不同粒径颗粒在特定的条件下有它固定的沉降高度。

The principle of improved method for calculating particle size tested by light transmission is to use the inherent sedimentary height of the same kind of powder with various sizes.

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介绍了磷化促进剂的分类，以及不同种类促进剂对磷化的影响和各自的作用原理。

The classify of phosphating accelerant, the effect of all kinds of accelerants and their different principles of action are reviewed in this article.

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本文通过最新研发的透析液，根据透析的原理，对书写在不同种类纸张上的不同种类的钢笔墨水字迹进行了书写时间测定。

According to the principle of dialysis, writing time of different kinds of fountain pen inks on different types of papers were measured using newly researched and developed dialyzates.

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