variable frequency meaning in English

变频可变频率
可变频率

Driven with variable frequency , less the energy consumption
变频调速，经济节能。
The reform of variable frequency energy conservation in paper mill
造纸厂变频节能的改造
The digital variable frequency sspeed regulation system based on dsp
的全数字交流调速系统
General specification for variable frequency and voltage power supplies
变频变压电源通用规范
The application of simens c504 in variable frequency driver system
504在变频调速系统中的应用

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