短語詞組短語electric semaphore signal 電動臂板信號機electric pulse signal 電脈沖信號electric potential signal 電位信號electric digital signal processing 數(shù)字信號処理electric power signal 電網(wǎng)信號electric zero signal 電氣零點信號electric excitation signal 電激勵信號electric railway signal machine 電動信號機electric stimulation signal 電刺激信號 返回 electric signal