When using sorbitic extractors, try to teach and explain packing method.

在使用沙氏提取器时，应作试教，讲解安装方法。

The paper deals with the microstructrures and hight-temperatrure hardness of highchromium white cast iron with the austenitic and sorbitic matrices.

本文主要论述了以奥氏体及索氏体为基体的高铬白口铁的组织和高温硬度。