精密頻率控制 control precision: 控制精確度precision control: 精密控制precision carrier frequency offset: 精確載頻補(bǔ)償precision frequency meter: 精密頻率計precision frequency standard: 精確頻率標(biāo)準(zhǔn)下載手機(jī)詞典可隨時隨地查詞查翻譯