The paper discusses the technique of increasing surface power voltage class from 380v to 660v.

本文就地面供电电压等级由380v提高到660v电压技术问题进行探讨。

youdao

The paper discusses the technique of increasing surface power voltage class from 380v to 660v.

本文就地面供电电压等级由380v提高到660v电压技术问题进行探讨。

youdao