回波信號(hào) echo signal: 回波信號(hào); 回聲信號(hào)echo-signal: 回聲信號(hào),回波信號(hào)amplitude modulated echo signal: 調(diào)幅回波信號(hào)echo signal of sounder: 測(cè)深儀回波信號(hào)frequency-modulated echo signal: 調(diào)頻回波信號(hào)下載手機(jī)詞典可隨時(shí)隨地查詞查翻譯