synchronous frequency changer 同步变频机

synchronous frequency booster 同步频率放大器

synchronous frequency encoding technique 同步频率编码技术

synchronous frequency division multiple access 同步频分多址

digital synchronous frequency-modulation inciter 调频同步激励器

sfet synchronous frequency encoding technique 同步频率编码技术

synchronous frequency chrage 同步变频机

synchronous frequency control 同步频率控制

synchronous frequency-converter 同步变频器