adjust speed by frequency conversion的用法和样例：
- Features To adjust the speed by frequency conversion, negative pressure wind function, large volume, lower noise.To remove the thrum, dusts and furs which bind together with garments and bed items.
- Regulating Speed by Frequency Conversion
- The Application of Adjusting Speed by The High-Voltage Frequency Conversion in the Power Plant
- Come in and out bottle is easy. Frequency conversion adjusting speed.