international distress code

同义词释义

1)international distress code,国际遇险求救电码2)international distress code,国际遇险呼救电码3)international distress,国际遇险信号4)international weather code,国际电码5)radio-telephone distress frequency,无线电话遇险呼救频率6)international distress frequency,国际遇险呼叫频率