短語詞組短語electric semaphore signal 電動(dòng)臂板信號機(jī)electric pulse signal 電脈沖信號electric potential signal 電位信號electric digital signal processing 數(shù)字信號處理electric power signal 電網(wǎng)信號electric zero signal 電氣零點(diǎn)信號electric excitation signal 電激勵(lì)信號electric railway signal machine 電動(dòng)信號機(jī)electric stimulation signal 電刺激信號 返回 electric signal