variable frequency adjustable speed的用法和樣例：
例句
- The maturing of variable frequency technology becomes an assurance for the reliable operation of a trolley type scraper.
變頻調速技術(shù)的成熟是滑線(xiàn)式鏟運機可靠工作的保證。 - Potpourri control of the microcontroller Frequency Control System is used to thinking poor frequency control.
單片機控制的變頻調速系統設計思想是用轉差頻率進(jìn)行控制。
