短語(yǔ)詞組短語(yǔ)distress radio frequency 遇險(xiǎn)無(wú)線電頻率radiotelephone distress frequency 無(wú)線電話遇險(xiǎn)頻率DF Distress Frequency 求救頻率international distress frequency [水運(yùn)][通信]國(guó)際遇險(xiǎn)呼救頻率;國(guó)際遇險(xiǎn)頻率;國(guó)際危難呼救頻率;翻譯radiotelegraph distress frequency 無(wú)線電報(bào)遇險(xiǎn)頻率radiotelephone distress frequency watch 無(wú)線電話遇險(xiǎn)頻率值班telephone distress frequency 無(wú)線電話遇險(xiǎn)呼救頻率idf international distress frequency 國(guó)際遇險(xiǎn)呼救頻率international boundary distress frequency 國(guó)際遇險(xiǎn)呼救頻率 返回 distress frequency