variable frequency speed control technique

• 变频调速技术

variable frequency speed control technique的用法和样例：

例句

1. The maturing of variable frequency technology becomes an assurance for the reliable operation of a trolley type scraper.
   变频调速技术的成熟是滑线式铲运机可靠工作的保证。
2. The paper mainly introduces the technology of adjusting speed of convertor and its superiority.
   主要介绍变频器的调速技术及使用变频器的优越性。