The main technological characteristic is to prevent from contacting with air during the process of making powder.
其工艺特征主要是制粉过程与空气避免接触。
The technological characteristic of computer button, the design and condition of injection forming were analyzed.
分析了电脑按钮塑件的工艺特点、成型方案及注射成型条件，并详细介绍了模具的设计要点。
Caking property is an important technological characteristic for coal. It is an main reference index for metallurgical coal.
粘结性是煤的一项重要的工艺性质，是炼焦用煤的主要参考指标。
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