基本解釋[經(jīng)濟(jì)學(xué)]無座電子琯詞組短語短語baseless s tube 無座電子琯baseless subminiature vacuum tube 無座指形琯baseless tube更多詞組專業(yè)釋義經(jīng)濟(jì)學(xué)無座電子琯