变频器分类 converter, frequency: 变频器frequency converter: 变频器变频机; 变频器频率转换器; 频率变换器,周波变换器; 周波变换器frequency-converter: 变频器classifications: 分类frequency-modulation frequency converter: 频率调制与转换下载手机词典可随时随地查词查翻译