永久型 meaning in Chinese

permanent type

Standard specification for aluminum - alloy permanent mold castings
铝合金永久型铸造件标准规范
The antistatic mechanism and application of polymer antistatic agents are introduced
摘要介绍了高分子永久型抗静电剂的特点，作用机理和目前的应用概况。
Polymer antistatic agents have little relation to relative humiditiy , friction and washing , and the process of antistic could persist for a long time
高分子永久型抗静电剂对空气的相对湿度依赖性小，抗静电效果持久，无诱导期，不受擦拭和洗涤等条件影响。