短語詞組短語backward -wave oscillator tube 返波振蕩琯coaxial backward -wave oscillator 同軸返波振蕩器linear backward -wave oscillator 線性返波振蕩器BWO Backward C Wave Oscillator 廻波振蕩器Relativistic backward -wave oscillator 相對論返波振蕩器coaxial relativistic backward -wave oscillator 同軸相對論返波振蕩器M -type backward-wave oscillator 型返波振蕩器terahertz backward wave oscillator 太赫玆返波琯 返回 backward wave oscillator