短語詞組短語ultrasonic sound frequency 超聲頻率ultrasonic intermediate frequency 超聲中頻ultrasonic c frequency 超聲頻率ultrasonic pulse frequency spectra 超聲頻譜ultrasonic -frequency power supply 超聲電源ultrasonic frequency spectrum analysis 超聲頻譜分析ultrasonic frequency generator 超聲發(fā)生器ultrasonic frequency pulsed arc 超聲頻脈沖電弧ultrasonic frequency response model 超聲頻響模型 返回 ultrasonic frequency